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This article is part of the series Wildlife and Pastoralism.

Open Access Research

Expected climate change impacts on land and natural resource use in Namibia: exploring economically efficient responses

Jon I Barnes1, James MacGregor2* and Moira Alberts3

Author Affiliations

1 Design & Development Services cc, PO Box 25942, Windhoek, Namibia

2 Department of Economics, Gothenburg University, Gothenburg, Sweden

3 Independent consultant, PO Box 350, Riebeek-Kasteel, 7307, Western Cape, South Africa

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Pastoralism: Research, Policy and Practice 2012, 2:22  doi:10.1186/2041-7136-2-22


The electronic version of this article is the complete one and can be found online at: http://www.pastoralismjournal.com/content/2/1/22


Received:11 June 2012
Accepted:28 August 2012
Published:28 September 2012

© 2012 Barnes et al.; licensee Springer.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper informs policy over the efficiency of investments on Namibia's rangelands both now and under future expected climate change. It is in this setting that Namibia's pastoralist communities, communal conservancies and increasing numbers of wildlife reside, and their economic activity dominates. We bring the principles of economics to decision-making. We analyse primary land uses, livestock production and wildlife viewing tourism in three ecologically different biomes - the southern Karoo Biome, the central Savanna Biome and the northeastern Woodland Biome. We analyse how expected climate change will impact these investments to 2080. From an economic perspective, pastoralism and wildlife-based tourism developed within common property management systems can be sound investments across Namibia's communal lands. Furthermore, as climate changes, the existing economic benefits to the Namibian economy associated with pastoralism and wildlife-based tourism should be magnified, as capital-intensive commercial fenced ranching systems become less economic. Recent research indicates that adoption of good rangeland management principles involving flexible herding, economies of scale and commercially viable utilisation of invasive bush can significantly increase profits and economic returns on investment for livestock systems in Namibia. Furthermore, under conditions of expected climate change, our results indicate that income from natural resource use will be more resilient than livestock and other agricultural investments. Estimated losses in economic contribution will be highest in the agricultural sector, and in particular with commercial fenced ranching, and rainfed cropping. Climate change poses considerable challenges for pastoralists and other economic activity on Namibia's rangelands. Global climate modelling suggests that by 2080, Namibia's temperatures will have increased by some 3°C and rainfall decreased by 5% to 20%. Our results suggest that gradual change in climate over the next 70 years will see the potential national value of livestock income halved and that of tourism income reduced by one quarter. Active interventions should include shifts in livestock and rangeland policy, encouraging the adoption of more flexible and resilient systems and including efforts to make rangeland use less rigid and more able to change and adapt. Adaptation to climate change should include promotion of natural resource-based land uses such as continued expansion of the Community Based Natural Resource Management programme. Furthermore, national policy now recognises this, and implementation of the Namibia Rangeland Management Policy will provide incentives to invest in sound rangeland management.

Keywords:
Namibia; Livestock; Wildlife; Land use; Climate change; Economics

Introduction

Namibia embraces some 900,000 km2 and straddles the Tropic of Capricorn on the southwest seaboard of Africa. It is sparsely populated, with one of the driest countries in sub-Saharan Africa, containing biomes ranging from true desert on the west coast, through arid semi-desert and semi-arid savanna, to semi-arid and sub-humid woodlands in the northeast. Land use is based on natural rangelands and takes place commercially on private land, traditionally on communal state land, and to a lesser extent through leasehold in protected areas.

(Reid et al. 2007) used results from a stakeholder workshop exercise and a computable general equilibrium model to estimate likely overall impacts of climate change on the Namibian economy. They reported that over a period of 20 years, the annual losses to the Namibian economy could be up to 6% of gross national product (GDP) due to the impact that climate change will have on its natural resources. They argued that this will affect the poor most, with resulting constraints on employment opportunities and declining wages, especially for unskilled labour, and urged Namibia to take steps that will ensure ‘climate proofed’ policies and activities and to have a strategy to deal with displaced farmers and farm workers. (Reid et al. 2007) identified the need for climate change to be mainstreamed into policies and planning. (Turpie et al. 2010) have analysed the vulnerability of biodiversity and protected areas in Namibia in the face of climate change. They also examined adaptations expected to result and made recommendations in relation to possible interventions which might mitigate impacts.

(Humavindu et al. 2011) have analysed national-level policy options for the main agricultural and natural resource land uses under the national rangeland management policy (NRMP) (MAWF 2012). This policy is found to be economically efficient since costs associated with implementation of sound rangeland management are recovered through increased financial and economic income. Further, adoption of sound grazing management plans holds potential for significantly increased profits and returns on investment for rangeland users. Furthermore, as time goes on, with increased adoption and improved skills and understanding among range users, national income amounting to some N$5 billion (US $610 million at September 2012 prices) might be added to the national economy from the rangeland use sector. Such benefits can go a long way towards mitigating and reversing the anticipated negative effects of climate change and increasing drought incidence in Namibia.

The present study, conducted in parallel with that of (Turpie et al. 2010), reports on a specific study on the impacts of climate change on the main agricultural and natural resource land uses of Namibia (the study area). It examines these land uses from a financial and economic point of view and assesses the changes in direct economic contribution that could be expected to result from climate change. The likely impacts of expected changes in climate were interpreted in terms of their effect on the natural resource base. The resulting changes were applied using sensitivity analysis in land and natural resource use enterprise models to determine effects on the profitability and economic contribution of these activities. Most analytical emphasis was placed on primary land uses, livestock production and wildlife viewing tourism in three ecologically different biomes - the southern Karoo Biome, the central Savanna Biome, and the northeastern Woodland Biome. However, all land and natural resource uses in these areas were considered. These are described below.

Crop and livestock production

Livestock are the mainstay of agricultural production and land use in Namibia. The Woodland and Savanna biomes, found in the north east, north and centre, are essentially dominated by cattle, with lesser amounts of small stock. The Karoo biome found in most of southern Namibia is dominated by small stock (sheep and goat) production.

All livestock production is based on extensive systems, breeding and rearing or rearing of stock, based on the productivity of natural rangeland. Cattle are kept on privately owned or leased commercial land on medium-scale fenced farms averaging some 15,000 ha each to produce beef. They are also kept on state-owned communal land, mostly in unfenced common property systems on a small-scale around villages to produce meat, milk, as transport and as a store of wealth. They are also kept at medium-scale cattle posts away from villages for the production of beef and as a store of wealth. Some commercial production in fenced land is taking place in communal land mainly to produce beef and as a store of wealth. Fenced commercial farms in the arid south are used to produce mutton sheep and karakul pelts with small amounts of wool, and goats are kept for meat production. On communal land in the south, small-scale production of sheep and goats, also for mutton, pelts and goat meat, takes place on open access or partly fenced properties. Traditional nomadic and semi-nomadic livestock keeping in the arid west and south of the country is no longer prevalent, and almost all extensive livestock keeping on rangeland is sedentary around fixed water points. Relatively unimportant livestock systems include intensive dairy, pig and ostrich production on commercial land.

Livestock stocking rates on rangeland are maintained by commercial farmers at around the most biologically productive carrying capacities (between 10 and 15 ha per large stock equivalent unit in the north and northeast, and between 15 and 25 ha per large stock equivalent unit in the south and extreme west). In communal common property systems, the stocking rates are closer to the biological limits, the ecological carrying capacity (between 5 and 7 ha per large stock equivalent unit in the north and northeast, and between 7 and 12 ha per large stock equivalent unit in the south and extreme west). Herd and flock productivities (calving/lambing rates, mortality rates and animal growth rates) tend to reflect the stocking rates, highest in commercial land and lowest in the communal open access systems. Cattle post systems tend be between the two in terms of stocking rates and productivity. The carrying capacities referred to here are derived from (Mendelsohn et al. 2006), and reflect empirically established norms of the Ministry of Agriculture Water and Forestry.

Both dryland (rainfed) and irrigated crop production are practised in Namibia. Dryland crops are grown in association with small-scale livestock production within agro-pastoral systems in the north and northeast. Here, low-input, small-scale production of millet, maize and sorghum, sometimes with associated field beans, are grown. Yields are low, and on average, in one of three years, crops fail. Households producing crops tend to produce less than half of their annual subsistence needs, relying on cash purchases to fill the gap. Medium- to large-scale dryland crop production takes place on commercial land, mostly in the northeast, where maize is the primary crop.

Irrigated crop production takes place on commercial land in the south along the Orange and Fish rivers, in communal land in the northeast along the Okavango river, and to a lesser extent, in the northwest, associated with the Kunene river. A variety of crops is produced, including a mix of food crops and higher value cash crops. In the south, table grape production is very significant. Also grown there are fodder crops and maize, among numerous others. In the north and east, in mostly state-run schemes, the emphasis has been on food crops, but increasing amounts of higher value crops are being introduced. The Green Scheme is an ambitious state-driven initiative aimed at significantly boosting irrigated crop production in the country. A notable feature of irrigated agriculture is that schemes in the south tend to be financially and economically viable, while those in the north tend to have poor or non-existent financial economic viability. This is largely due to the location, remote from markets for inputs and products of the northern schemes (Barnes et al., unpublished work).

Tourism, wildlife production and natural resource uses

Tourism is a rapidly growing sector in Namibia, and the leisure tourism component of this, which makes up some 40%, is dominated by nature-based pursuits. The nature-based component is attributable to a range of natural assets, including scenery and wildlife, which are the most important. (Barnes et al. 2009) used data from the tourism survey of (SIAPAC 2007) to estimate that wildlife contributed some 50% of the value of nature-based tourism. Approximately 80% of the value of nature-based tourism is non-consumptive, based in lodge or camp accommodation in the commercial land, state land (parks), and communal land. The other 20% consists of consumptive tourism, dominated by trophy hunting, which takes place mostly on commercial land but also on communal land and state land. Another, lesser, consumptive tourism component consists of marine shore angling.

Tourism on commercial land takes the form of landholder enterprises, while that on state and communal takes the form of leasehold enterprises in joint venture partnerships with land holders - either government or local communities. The well-established community-based natural resource management (CBNRM) programme enables communities on communal land to form common property conservancies through which they can manage and utilise wildlife mostly for tourism. Tourism as described above holds significant comparative advantages for Namibia as it is not entirely dependent on scarce and erratic rainfall, but also makes use of the natural beauty inherent in the landscapes. Tourism potential tends to be localised around areas of high scenic value and high wildlife concentrations.

The use of wildlife other than through tourism takes place on commercial land through consumptive harvesting of game for own use, small-scale meat sale, live game capture and sale, and medium-scale commercial meat sale. Most of this use takes place as supplementary enterprises alongside livestock production or tourism enterprises. Wildlife numbers have been increasing relative to livestock numbers, which have generally been declining on commercial land. This is a function of higher perceived potential returns, which have induced investments in wildlife within an improved property rights setting (Barnes and Jones 2009). Wildlife use on commercial land ends to be fenced at least at large scale, while that on communal land is generally unfenced. Although wildlife-based and livestock land uses commonly take place together at regional and landscape scale, they tend to be separated spatially at farm/conservancy and enterprise scale.

The use of wild plant resources takes place mostly on communal land and to a lesser extent on commercial land. Nearly all rural households harvest wood for fuel, poles for building, and non-timber wild plant products for food, medicines and as raw materials for crafts. A significant charcoal industry is developing on commercial land where bush encroachment has been a problem. Inland fishing is practised in the wetlands of the northeast and north. Here, households operate at a small scale to harvest fish from rivers and floodplains. The use of natural resources on communal land is generally undertaken by individual households in an open access setting. In a small number of areas, common property management is being applied through community-based organisations such as conservancies and community forests.

Methodology

Review of climate change predictions

The evidence for anthropogenic climate change as it applies to Namibia was reviewed. Much of the work already done in this region is based on older generation climate scenarios dating from the early 2000s, and the Third Assessment Report of the Intergovernmental Panel on Climate Change (IPCC TAR). Later generation climate change scenarios have been developed for the Fourth Assessment Report (IPCC AR4). Key references were GF Midgley and D Gou (unpublished work), (Turpie et al. 2010), (Midgley et al. 2005), who used these scenarios in the context of Namibia.

Development and analysis of land use enterprise models

The livestock systems and tourism wildlife viewing enterprises in Namibia were modelled to provide financial and economic measures of value. Standardised financial and economic, spreadsheet, enterprise appraisal models as developed in the economics unit of Ministry of Environment and Tourism (MET) were developed for each enterprise. These include annualised budgets and 10-year enterprise development streams valued in Namibia dollars (N$) at constant 2008 prices, where N$1:00 = US$0.13.

The financial analyses measured the profitability for investors or the financial incentive to engage in the activity. The economic analyses measured the value added by these activities to the national income, measured as the direct net change in gross national income. No account was taken of the indirect value added associated with the activities, though backward and forward linkages. Nor was account taken of indirect use values (ecosystem service values), and non-use values (existence, bequest and option values).

For the purpose of this study, the parameters, assumptions and estimations for the models were derived from work done in Botswana and Namibia at various times. Parameters for the Savanna and Woodland biome livestock models were determined using data from (Barnes et al. 2008) and Barnes et al., unpublished work). The parameters for the wildlife viewing tourism models in the Savanna biome were determined using data from (Massyn et al. 2008). The Woodland biome tourism parameters were derived from (Alberts 2007), and the Karoo biome livestock and tourism parameters were derived from JI Barnes and MN Humavindu (unpublished work).

These were then valued to estimate financial values for initial and ongoing capital requirements, recurrent variable and fixed operating expenses, and recurrent enterprise gross income. The annual net income (profit), income accruing to local communities, was determined. The overall financial return on investment was measured as the 10-year internal rate of return and the 10-year net present value. Tables 1, 2, 3 and 4 show some of the parameters used in the enterprise models.

Table 1. Comparative key parameters used in base case models for the Woodland and Savanna biome livestock systems

Table 2. Comparative key parameters used in base case models for the Karoo biome livestock systems

Table 3. Comparative key parameters used in base case models for tourism wildlife viewing enterprises in the Woodland, Savanna and Karoo biomes (2008)

Table 4. The estimated extent of land divided according to tenure in Namibia

The livestock systems modelled for the Woodland and Savanna biomes included unfenced traditional small-scale livestock keeping on open access communal land, unfenced cattle posts, medium-scale ranching on partially exclusive communal land and fenced commercial medium- to large-scale ranching (breeding and rearing) on fully exclusive commercial land. All these were dominated by cattle and entailed some form of breeding and rearing. The traditional small-scale system is typical of the more densely settled areas of communal land where stocking rates are high and overall herd growth is slow, while the medium-scale cattle post system is expanding into open communal land where stocking rates are moderate and the overall herd growth is high. In the fenced commercial systems, stocking rates are maintained at near optimal levels for biological productivity, allowing for highest herd productivity and moderate herd growth.

In the Karoo biome, the livestock systems, dominated by small stock, included unfenced traditional small-scale small stock production on communal land and fenced large-scale commercial small stock ranching on commercial land. These involved breeding of karakul sheep for pelts, and or breeding and rearing of sheep and goats for meat production.

The tourism systems modelled in all biomes involved exclusive unfenced commercial large-scale non-consumptive tourism with lodge development on communal land. The models involve a leasehold system where the tourism investors do not own the land or wildlife stock. Generally, lower livestock stocking rates, on commercial land and in the open parts of communal land, enable wildlife populations to survive and provide the basis for investment in wildlife conservation and use through tourism. As stated, financial and economic comparative advantage has ensured a steady relative increase in wildlife-based land use in these areas (Barnes and Jones 2009).

The assumptions used in the livestock system models differed slightly between those for the Woodland and Savanna biomes. However, the differences were small, as the higher primary productivity in the wetter northeastern woodlands tends to be offset by less favourable vegetation structure for livestock grazing.

The use of enterprise models for sensitivity analysis was restricted to the livestock and tourism land uses described above. For other land and natural resource uses, enterprise models were used subjectively to assess the likely impacts of climate change on their net incomes and economic contributions. Models for several land and natural resource uses were derived from Barnes et al. (unpublished work). These included models for small- and medium-scale rainfed crop production, as it takes place in the north and northeast of the country, large-scale commercial irrigation along the perennial rivers and small-scale inland fishing enterprises. Models for wild plant use were derived from (Barnes et al. 2005, 2010). The models developed of community-based natural resource management (CBNRM) initiatives by (Barnes et al. 2002) were also used to examine the resilience of community conservancies to changes in rangeland productivity.

Aggregate economic value of agricultural production and natural resource use

The land uses described above have been valued in terms of their contribution to the gross national income. This is the baseline for measuring the likely economic impacts of climate change. The study focused on the land use activities. Only their direct impacts on the national economy were measured, and no account was taken of backward and forward linkages associated with these land and natural resource uses. Thus, value added through enterprises, supplying inputs to the land and resource use activities, or value added as a result of product processing such as meat processing, is excluded. The values are given in value added to the gross national income (GNI).

The basis for the agricultural values is the national accounts' GDP by activity data, presented by IPPR [Institute for Public Policy Research] (2009), which cover the period between 1990 and 2005, divided into commercial and communal agriculture. With the use of ratios from (Sherbourne 2009) and (Mendelsohn et al. 2006), the data were disaggregated into those attributable to commercial land livestock, communal land livestock, commercial land crop production and communal land crop production. The commercial land livestock value was further disaggregated into cattle and small stock. These values were projected to 2009 using the averages of real annual growth rates recorded between 1995 and 2005 and then inflated as appropriate to reflect 2009 prices. The annual growth rate applied for the commercial sector was 3.4% and that for communal sector was 2.1%.

Natural resource values were derived from various sources. Values for nature-based tourism, including trophy hunting tourism, were derived from the wildlife accounts (Barnes et al. 2009) and verified through comparison with the studies by (Turpie et al. 2010) in the value of parks, and the tourism satellite accounts WTTC/World Travel and Tourism Council (2006) and (Barnes et al. 2010, 2008). These values were subjected to real growth of 5.5% per annum to 2009, reflecting growth rates recorded and predicted by (WTTC 2006) and adjusted to take account of the 2008 economic downturn. They were then also inflated to reflect 2009 prices. Values for wildlife use other than tourism were derived from the wildlife accounts (Barnes et al. 2009). They were adjusted to 2009 values, through real growth at 7.2% per annum, based on average growth between 2004 and 2007, recorded by T Uahengo, (personal communication), adjusted to take account of the 2008 economic downturn and thereafter inflated accordingly.

Values for the use of wild plants were derived from the forest accounts which include the use of non-timber wild plant products (Barnes et al. 2005). They were adjusted to 2009 figures using the expected real annual growth rate of 4.2% predicted in the accounts, adjusted to take into account the 2008 economic downturn and inflated accordingly. Values for inland fish use were derived from the 2008 values estimated by Barnes et al. (unpublished work), extrapolated to all areas with inland fisheries and inflated accordingly. These values then disaggregated according to those attributable to state land (protected areas), communal land and commercial land. This was done using areas estimated using a dot counting technique and modified subjectively according to the knowledge regarding the distribution of resources and land uses.

Aggregate values were thus described according to the three integrated regions subdivided between state, communal and commercial lands. The extents of these different tenure types in the country were estimated, as shown in Table 1, and values were then expressed per square kilometre within each land tenure category, again divided between the three integrated regions.

Next, using the results from the sensitivity analysis of land use enterprise models, the impact of likely climate change on carrying capacities for livestock and wildlife and on tourist visitor numbers, as described in the analysis above, was assessed. Again, the measure of economic value is the direct contribution of land and resources to the GNI. The impact is assessed in terms of how much of the baseline direct GNI values, as measured above, will change by 2080 as a result of the climate change predictions. It is noteworthy that this analysis was done by superimposing the 2080 setting after climate change on current land use. It does not take into consideration autonomous adaptations that are expected to happen, or adaptations resulting from policy interventions, or changes in population growth, which will happen between the present and 2080.

The challenge was to convert the predicted changes in physical livestock, wildlife and tourist numbers, referred to above, into changes in GNI contribution. For this, we used detailed spreadsheet enterprise models for livestock, tourism and natural resource use activities. These empirically based budget and cost-benefit models measure, among other things, the annual direct contribution to GNI. With the use of sensitivity analysis, the impacts of changes on carrying capacity, tourism numbers and output on GNI contribution can be measured. Specifically, the models on land use developed in this study were used. The latter study used enterprise models for 11 different land uses, examining communal and commercial land livestock systems and non-consumptive tourism systems. Results of the sensitivities on these models are shown in Additional file 1.

Additional file 1. Appendix 1. Woodlands biome - commercial livestock.

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Results

Climate change predictions

GF Midgley and D Gou (unpublished work) used model results from IPCC AR4 (the United Nations Intergovernmental Panel on Climate Change Fourth Assessment Report) to estimate the likelihood of the outcomes estimated using older scenarios. They noted that the model projections of the earlier IPCC TAR (the United Nations Intergovernmental Panel on Climate Change Third Assessment Report), used by (Midgley et al. 2005), are broadly comparable with median projections assessed in AR4, in that a similar level and spatial pattern of warming is consistent and that a comparable reduction in rainfall is projected. In the present study, we have used the findings of GF Midgley and D Gou (unpublished work) as the basis for our model projections.

The models used (IPCC TAR and AR4) are extremely complex global models which require very large numbers of runs to develop predictions. At the scale of southern Africa, they are thus coarse, and it is difficult to get the spatial downscaling needed to make accurate predictions at country level in Namibia. Nevertheless, averages of 21 IPCC AR4 models show a consistent trend to higher temperatures, with an increase in annual mean temperature between 3°C and 4°C expected by 2080. Regarding precipitation, the picture is less certain with the averages for 21 IPCC AR4 models showing decreases in mean annual rainfall between 5% and 20% by 2080. The most significant declines can be expected in the south and centre of the country. This is consistent with the continent-wide finding that it is the southwestern arid zone of southern Africa that will be likely to suffer high declines in rainfall compared to the wetter parts, to the east of Namibia. However, the dominant feature of the predicted changes, particularly as regards precipitation, is an increase in variability.

The effects of higher temperature will result in higher evaporation, and this, combined with expected lower rainfall, would cause significant reductions in rangeland carrying capacity. In the analysis on impacts on ecosystems and biodiversity, GF Midgley and D Gou (unpublished work) suggest a reduction in ground cover and reduced net primary productivity throughout much of the country by 2080. They estimated changes in grass biomass ranging from around −10% in the Woodland of the northeast, around −5% in the Savanna and around −10% in the southern Karoo areas. They estimated that primary productivity overall might have no change in the Woodland and might drop by some 5% in the Savanna and Karoo biomes. These indicated changes, by 2080, have been used in the interpretation of carrying capacity changes below.

It must be acknowledged that increased concentrations of CO2 may result in a fertilisation effect as predicted by the dynamic global vegetation model described by (Scheiter and Higgins 2009). This modelling approach uses climate and soils information to predict the changing relative success of a few main plant functional types. The model has a strong physiological basis, including calculations of carbon uptake via photosynthesis (dependent on light, water, temperature and nutrient availability), respiration and growth, carbon allocation to above and below ground parts, decomposition and wildfire. The model has been shown to simulate African savanna and grassland vegetation structure and function to a credible degree (Scheiter and Higgins 2009). As with all global climate change models, there are difficulties with the spatial downscaling to make clear predictions for Namibia, but the results indicate small expansion of the grass biomass conditions prevailing in the south into the central areas of the country by 2080. In the north central and northeast, they indicate possible increases in grass biomass. They also suggest a decrease in woody plants less than 2 m tall in most of the central and northern parts. For woody plants more than 2 m tall, little change or possibly an increase is suggested for the central and northern areas.

It is uncertain whether CO2 fertilisation will increase plant biomass. This effect, if any, could be expected in the wooded north and northeast, but it would be offset by the ultimate changes in precipitation, if any. As stated, for the interpretation of carrying capacity changes, below, we used the changes indicated by (Midgley et al. 2005). It has been estimated by (Turpie et al. 2010) that these changes would likely be accompanied by losses in both grazer and browser carrying capacities of between 13% and 15%.

Surface water flows are predicted to decline by up to 15% in the Orange river system to the south and 10% in western ephemeral rivers. There is less certainty about flows in the north and northeast flowing out of Angola, but some predictions suggest decline, which will also affect the wetlands associated with these systems. Combined with significantly increasing demand, the pressure on Namibia's surface water resources will be dramatic.

Financial and economic analysis of land use enterprises

Tables 5, 6 and 7 show the base case financial and economic characteristics of the livestock and tourism enterprises modelled. Generally, traditional small-scale cattle keeping, as practised in the Woodland and Savanna biomes, is shown to make efficient use of capital and to provide significant income for participating households. However, these returns tend to be dependent on the maintenance of reasonable levels of herd productivity. Open access to grazing, which commonly prevails with this system, has the effect of driving down herd productivity and the net economic contribution (Barnes et al. 2008). The diversity of products lends stability to the system. In the Karoo biome, traditional small-scale small stock keeping, represents a small commercial operation. Here, diversity of products is low, and the system suffers from diseconomies of scale coupled with typically low incomes earned from open access grazing. Improvement of flock productivity while keeping capital inputs low would considerably enhance the value of this system.

Table 5. Financial and economic values associated with livestock systems and tourism wildlife viewing enterprises – Woodland biome (N$, 2008, where N$1.00 = US$0.13)

Table 6. Financial and economic values associated with proposed livestock systems and tourism wildlife enterprises - Savanna biome (N$, 2008, where N$1.00 = US$0.13)

Table 7. Financial and economic values associated with proposed livestock systems and tourism wildlife viewing enterprises – Karoo biome (N$, 2008, where N$1.00 = US$0.13)

Commercial cattle ranching, mainly in the commercial land of the Woodland and Savanna biomes, and commercial small stock ranching in the Karoo biome all represent relatively capital intensive systems, with fencing and water provision being important assets. They depend on gains in productivity resulting from relatively intensive infrastructure and management inputs, and their net returns are sensitive to cost increases. Cattle post systems are less intensive with lower capital requirements and less dependence on proximity to markets, and they benefit from only moderate gains in productivity that resulted from their partial exclusivity.

Additional file 1 shows the results of sensitivity analyses on the models aimed at examining the direct effects on net incomes, particularly GNI contributions, of the carrying capacity changes expected by 2080.

As described above, the likely general effects of climate change in Namibia will be higher temperatures and likely lower mean annual rainfall. These will combine to increase evapotranspiration and reduce rainfall effectiveness. This should reduce primary productivity, but this reduction may be offset to some extent by CO2 fertilisation. To go with these changes, there is strong evidence that there will be greater variability in climate and thus in ecological systems, which are already highly variable.

The land uses described above will be affected by reductions in rangeland carrying capacities. Before systems adapt, there will likely be effects of livestock production parameters such as reduced calving rates and higher mortalities. The sensitivities for these parameters are thus highly significant. Lower production in the face of increasing demand for products may tend to increase meat prices, particularly locally in Namibia. The lower production per unit of land will also tend to increase capital costs relative to production capacity. It is noteworthy that these initial analyses disregard the fact that, by 2080, some 70 years into the future, there may be gradual adaptation to change, through the emergence of more extensive systems and lower production per hectare. Such adaptation is discussed below.

A study of the likely impact of climate change on the gross incomes of landholders practising livestock production and trophy hunting in the commercial land was carried out by (Brown 2009). She used regression analysis on questionnaire returns for a sample of 60 commercial farmers to get farmer perceptions on how their incomes would be affected in the face of climate change scenarios, similar to those identified in this study. For fenced commercial livestock production, it was estimated that gross incomes would decline to some 40% of current levels by 2080, and trophy hunting gross incomes would decline by more. Trophy hunting is more profitable, as an enterprise, than livestock ranching, and a drop in gross income means less in terms of a drop in net returns for trophy hunting than is the case with livestock. For the purposes of the sensitivity analyses on livestock systems, changes in gross output along these lines were examined.

As little is known of the likely impacts of climate change on tourism, the results of a specific survey among tourists using protected areas, described by (Turpie et al. 2010), were used to predict the expected impacts of climate change on tourism visitation numbers. A demand function, derived by (Turpie et al. 2010) from their protected area tourism survey data, indicated that, nationwide, the numbers of tourist visits will be likely to drop to some 85% of the current numbers by 2080, as a result of climate change. A 15% loss in gross output was examined in the sensitivity analyses for tourism enterprises.

Some interesting findings emerge from the sensitivity analyses. The possible effect of increased meat product prices will tend to be offset by increased capital costs in all the livestock systems analysed. In all biomes, losses of 40% of gross incomes will make fenced commercial ranching nonviable both financially and economically. With cattle posts in the Woodland and Savanna biomes, the effect will not be as severe, but financial and economical viability will be reduced significantly. In the case of traditional livestock keeping, the effects of climate change on financial and economic viability will be least. This underlines the inherent efficiency of these systems, which is only negated by the problem of open access grazing, which, as expected from theory and as shown by (Barnes et al. 2008), can drive down productivity. The viability of traditional small-scale livestock keeping in the Karoo biome is, on the other hand, relatively sensitive to climate change effects, reflecting the nature of this system, which tends to resemble small-scale commercial ranching.

In the tourism systems analysed, relatively small losses in financial and economic viability will result from climate change. This makes sense on several grounds. The tourism product is only partially made up by wildlife, with some 50% of it related to scenery and other nonbiological attributes. This is particularly the case not only in the arid Karoo biome, but also in the Woodland biome. Perhaps related to this, the (Turpie et al. 2010) survey of tourists estimated that tourist numbers (and gross outputs) might drop by only 15%. The basic financial and economic viability of the tourism enterprises tends to be higher than it is for the commercial livestock systems, minimising the effects of income losses.

Baseline aggregate economic values of land and natural resource use

The estimated direct economic contributions in terms of value added to the national income by agricultural land use and natural resource uses in Namibia are documented in Table 8. Table 9 shows these values expressed per square kilometre.

Table 8. Estimated direct gross national income contributed by agricultural production and natural resource uses in 2009

Table 9. Estimated direct gross national income contributed per square kilometre by agricultural production and natural resource uses in 2009

In terms of tourism, wildlife and natural resource uses, some N$3.8 billion (US$ 490 million) was generated in 2009. This is dominated by two main components - tourism (47%) and natural plant use (44%). Currently, 70% of tourism value is generated in the commercial land, where property rights have allowed a rapid expansion of nature- and wildlife-based land uses. There remains significant potential for tourism development within parks and communal areas. Some 79% of natural plant use takes place in the communal areas, mostly in the north central part of the country (North West broad integrated region) where almost all rural households make use of wood and other natural products of plant origin. There is only localised overuse of these resources, and overall, they are relatively abundant, making for high value added and rent generation, despite the fact that use of the resources is effectively open access in nature.

It can be seen that agricultural production land uses generated some N$3.23 billion (US$ 420 million) in terms of gross national income value added to national income. Some 77% of this is attributable to livestock. Commercial land contributes some 74% to total agricultural land use production value and 79% of livestock production value.

Expected changes in aggregate economic value

The findings above combined with the findings of (Turpie et al. 2010) were used to predict losses in livestock and wildlife numbers in Namibia, resulting from climate change. Reduced carrying capacity and shifts in land suitability mean that large stock numbers will be particularly hard hit by climate change. The analysis indicates that, nationwide, numbers of cattle in fenced ranches can be expected to decrease to as low as 40% of the current levels by 2080. Numbers of communal livestock (small-scale and cattle post systems) can be expected to decrease to as low as 70% of the current numbers by 2080. Small stock, mostly in commercial areas, will tend to expand to the north, and numbers of small stock can be expected to remain around 100% of the present numbers.

Numbers of grazing wildlife species (the bulk of current wildlife biomass, particularly in the commercial areas) are expected to decrease to about 75% of the current levels. Disregarding expected growth in wildlife numbers in underutilised areas, the gross output for other (non-tourism) wildlife use can also be expected to drop to 75% of the current levels by 2080. Wild plant use, although highly valuable and suffering locally from depletion, is generally well under the national potential for use of these resources (Barnes et al. 2005). The uses are mainly carried out for essential communal land household livelihood strategies. Disregarding the fact that these uses are likely to increase as other options through agriculture are diminished, it is assumed for this impact analysis that the gross outputs for these activities will remain at 100% of the current levels by 2080. Similarly, inland fish production is treated as remaining at 100% of the current levels by 2080. Nationwide losses in numbers of livestock and wildlife, combined with the losses in financial and economic viability detected at enterprise level, provided the basis for the estimates below of losses in aggregate contribution to GNI by livestock and wildlife-based land uses.

Dryland crop production is expected to decline significantly by 2080 with production being restricted to Caprivi in the north alone, and that will be on the very margins of viability. Thus, it can be assumed that dryland crop gross output will decline to some 25% of the current levels. Irrigated production will attain more importance, and indeed, it is currently part of an ambitious expansion programme. However, increasing demand for decreasing surface flows particularly in Orange and Fish river systems in the south central broad integrated region will constrain development. These southern irrigation schemes are most viable, and expansion related to the Kavango, Zambezi and Kunene river systems in the northeast and northwest broad integrated regions will tend to be constrained by financial and economic viability problems. It is therefore assumed that despite increasing demand for irrigation development, the value added to GNI by irrigated agriculture will not grow but will remain at 100% of the current levels by 2080.

Before any consideration of adaptation, conditions expected to prevail by 2080 as a result of climate change may result in losses in the direct economic contribution of primary land uses amounting to N$2.5 billion or some 4% of the GNI. The losses are clearly highest with the agricultural sector. It is noteworthy that the estimated losses do not include indirect impacts on the economy that resulted from backward and forward linkages.

Discussion, conclusions and interventions

The predicted losses in tourism and livestock income described above will result from gradual change in climate over the next 70 years. This means that, on average, tourism value might decline at 0.4% per annum, and livestock income might decline at 1% per annum over that period. Land use systems will adapt autonomously at the same time, and extraneous economic factors will play an important part. Given autonomous adaptation, losses in production will tend to be reflected in loss of growth that would take place in the absence of climate change.

In Table 10, it can be seen that losses are clearly highest with the livestock sector and, in particular, with commercial fenced ranching. This is a result of the fragile financial and economic viability of this system, where a small drop in income results in a devastating loss in net income. Table 11 shows these losses per square kilometre.

Table 10. Estimated losses in direct gross national income contributed by agricultural production and natural resource uses in 2009

Table 11. Estimated losses in direct gross national income contributed per square kilometre by agricultural production and natural resource uses in 2009

From an economic perspective, pastoralism and wildlife-based tourism, combined at landscape scale and involving common property management, can be sound investments across Namibia's communal lands. Furthermore, as climate changes, the existing economic benefits to the Namibian economy associated with pastoralism and wildlife-based tourism will likely be magnified, as capital-intensive commercial fenced ranching systems become less economic. The inherent flexibility of small-scale livestock keeping, if it can be combined with enhanced community rangeland management, has significant potential. Without adaptation, fenced commercial ranching will likely increasingly fail and will tend to be replaced by less capital-intensive herding systems. In terms of long-term adaptation, it suggests that medium- to large-scale livestock farming systems will tend to become lower input in nature, with systems resembling the cattle posts of the communal lands rather than ranches. Cattle over much of the drier savanna areas may tend to be replaced by small stock.

Given the predicted increase in climate variability in the face of deteriorating environmental conditions, livestock land use will need to become more flexible and able to respond to economic forces. Active interventions should include shifts in livestock and rangeland policy, encouraging the adoption of more resilient systems, which are less rigid and more able to change and adapt. Recent research and analysis in Namibia (Humavindu et al. 2011) has found that adoption of good rangeland management practices, involving flexible herding, economies of scale and commercially viable utilisation of invasive bush, can significantly enhance private profitability and the economic contribution of livestock production. These inherent incentives are constrained by the fact that sound management requires significant skill. Policy as espoused in the new national rangeland management policy (MAWF 2012) recognises this and contains measures to enhance the necessary skills and promote good rangeland management. The community-based rangeland management initiative currently being promoted by the Millennium Challenge Corporation is showing signs of success and is relevant here.

Rainfed cropping, already marginal in terms of viability, will likely become nonviable and will be almost eliminated. Current national policy is ambitious regarding irrigation development, and this drive will likely be strengthened by losses in rainfed cropping. However, expansion of irrigation will likely be curtailed by increasing scarcity of water, particularly in the south, and problems with financial and economic viability, particularly in the north (Turpie et al. 2010). Active intervention should be focused on expansion of irrigation, based on sound development planning, to ensure the development is environmentally and economically efficient.

One example of adaptation already taking place is that, for largely economic reasons, wildlife stocks are currently in the process of increasing, and in certain parts of the country, they are displacing livestock herds. The climate-induced losses in demand for tourism will tend to be offset by natural growth in overall international demand for tourism and the potential for expansion of tourism in underutilised areas, particularly in state-protected areas and communal land. Climate-induced losses in grazing wildlife numbers should be offset to some extent by increases in wildlife on understocked land as well as the taking up of unused capacity for wildlife use in state-protected areas and communal lands. Wild plant use is generally well under the national potential for use of these resources (Barnes et al. 2010), and it is generally likely to increase as other livelihood options through agriculture are curtailed.

Table 10 indicates that income from natural resource use will be more resilient in the face of climate change. This is to be expected, given the generally lower reliance of these activities on primary production and rangeland carrying capacity. It suggests that adaptation to climate change should include strong promotion of natural resource-based land uses. This is something that is already taking place, as a result of economic forces and financial incentives. The CBNRM programme has been very successful in integrating and mainstreaming natural resource use in communal land use (NACSO 2004, 2006, 2008). It has been shown to be economically viable (Barnes 2008), has economies of scale and facilitates integrating land uses in a flexible manner under common property management. The commercial land conservancy programme has also introduced economies of scale and spatial flexibility to land use there.

Active intervention should thus involve further expansion of the CBNRM programme. It should be broadened to embrace rangeland management and wild plant use. It should be aimed at maximising comparative advantages in an environmentally and economically efficient way, for example, ensuring that those areas targeted as key in relation to losses in biodiversity are conserved. It should also be carefully planned to maximise its impact on rural livelihoods.

At a national level, implementation of the NRMP will promote improved management of national rangelands, which has been shown to be economically efficient. (Humavindu et al. 2011),show the benefits of ‘pincer movement’ focused on fewer national level subsidies coupled with both direct incentives to allow stocking and destocking and open access to all markets, and indirect incentives focused on community mobilisation and institution building in communal areas. Together, these measures harbour the potential to deliver economic benefits of rangeland management at the landscape and community levels at the same time as climate-proofing natural resource land use.

Competing interests

We declare that the authors have no competing interests.

Authors’ contributions

JIB conducted research, developed models, conducted analysis, and contributed to first drafting of the manuscript. JM coordinated and supervised the work and drafted the final manuscript. MA conducted research, updated models, conducted analysis and drafted the initial manuscript. All authors read and approved the final manuscript.

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