ReviewThe impacts of climate change on livestock and livestock systems in developing countries: A review of what we know and what we need to know
Introduction
Livestock systems in developing countries are changing rapidly in response to a variety of drivers. Globally, human population is expected to increase from around 6.5 billion today to 9.2 billion by 2050. More than 1 billion of this increase will occur in Africa. Rapid urbanisation is expected to continue in developing countries, and the global demand for livestock products will continue to increase significantly in the coming decades (Delgado et al., 1999). The potential impact of these drivers of change on livestock systems and the resource-poor people who depend on them for their livelihoods is considerable. These impacts will be influenced by both supply-side shifts in natural resource use as well as market-led demand changes. Given the complexity of livestock (and in most cases crop–livestock) systems in developing countries, a mix of technological, policy and institutional innovations will be required. On the technology side, improvements will be linked to a combination of feed and nutrition, genetics and breeding, health and environmental management options, with different combinations appropriate to different systems.
At the same time, the climate is changing. Significant changes in physical and biological systems have already occurred on all continents and in most oceans, and most of these changes are in the direction expected with warming temperature (Rosenzweig et al., 2008). For the future, there is considerable uncertainty, but recent “best estimates” of temperature increases from the IPCC in the Fourth Assessment Report (AR4) are in the range 1.8–4 °C in 2090–2099 relative to 1980–1999, depending on the scenario of future greenhouse-gas emissions that is used to drive the climate models (IPCC, 2007). The impacts of temperature increases at even the lower end of this range will be far-reaching. At the lower end of the range of temperature rise (1–3 °C), global food production might actually increase but above this range would probably decrease (IPCC, 2007). However, broad trends will be overshadowed by local differences, as the impacts of climate change are likely to be highly spatially variable. Climate change will alter the regional distribution of hungry people, with particularly large negative effects in sub-Saharan Africa. Smallholder and subsistence farmers, pastoralists and artisanal fisherfolk will suffer complex, localised impacts of climate change, due both to constrained adaptive capacity in many places and to the additional impacts of other climate-related processes such as snow-pack decrease, particularly in the Indo-Gangetic Plain, and sea-level rise (IPCC, 2007). Furthermore, changes in the frequency and severity of extreme climate events will have significant consequences for food production and food security; it is not only projected mean climate change that will have an impact. Increasing frequencies of heat stress, drought and flooding events are estimated to be likely, even though they cannot be modelled in any satisfactory way with current levels of understanding of climate systems, but these will have adverse effects on crop and livestock productivity over and above the impacts due to changes in mean variables alone (IPCC, 2007).
Of the planet’s 1.3 billion poor people, at least 90% of them are located in Asia and sub-Saharan Africa, and climate change will have major impacts on the more than 600 million people who depend on livestock for their livelihoods (Thornton et al., 2002). These impacts will include changes in the productivity of rain-fed crops and forage, reduced water availability and more widespread water shortages, and changing severity and distribution of important human, livestock and crop diseases. Major changes can thus be anticipated in livestock systems, related to livestock species mixes, crops grown, and feed resources and feeding strategies, for example.
The challenges for development are already considerable, and there is now general concern that climate change and increasing climate variability will compound these. However, there is only limited knowledge about the interactions of climate with other drivers of change in agricultural systems and on broader development trends. Such work is increasingly important for evaluating how farming systems may evolve in the future. Part of this work involves trying to understand the likely impacts of climate change on vulnerable people through its effects in and on other sectors. These include impacts on water resources and other ecosystems goods and services, and human health and nutrition, for example. Enhanced understanding is needed of the likely impacts of climate change on the vulnerability of the resource-poor, so that resilience to current climate variability as well as to the risks associated with longer-term climate change can be gauged, and appropriate actions set in place to increase or restore resilience where this is threatened. (The long term here refers to the next three to five decades, while the short term refers to 3–5 years into the future.)
In this paper, we briefly review some elements of the complex relationship between livestock and climate change in developing countries. Livestock globally play a considerable role in climate change, in terms of their contribution to greenhouse-gas emissions. This has been reviewed and extensively discussed by Steinfeld et al. (2006), and is not dealt with here. Section 2 provides a brief overview of a classification of livestock systems in developing countries, which is used as a framework for the review. Section 3 reviews the literature on what is known concerning the impacts of climate change on livestock. Many of the relationships are two-way (for example, livestock have obvious impacts on water resources and biodiversity, as well as these things being affected by climate change and having impacts on livestock), but that is not the focus here. Some of the livestock-related responses to climate change are considered in Section 4, in terms of possible researchable issues related to adapting to climate change and to mitigating the livestock-related impacts on climate change. Some final remarks are made in Section 5.
Section snippets
A classification of livestock systems in the developing world
We use the systems classification of Seré and Steinfeld (1996), whose methods were built on the concept of the agro-ecological zone. There are two parts to the classification. The agro-climatic part is based on the length of growing period (LGP), defined as the period in days during the year when the rainfed available soil moisture supply is greater than half the potential evapotranspiration (PET). It includes the period required to evapotranspire up to 100 mm of available moisture stored in the
Climate change’s impacts on livestock
Impacts of climate change on livestock are outlined below, organised under seven headings: feeds, quantity and quality; heat stress; water; livestock diseases and disease vectors; biodiversity; systems and livelihoods; and indirect impacts.
Responses to climate change impacts in livestock systems
If the European Union target of stabilising climate temperature increases to 2 °C above pre-industrial levels is to be met, this is likely to require stabilisation of the CO2 concentration below 450 ppm. This is certainly possible, and some see this as an economically attractive goal (Stern, 2006). Meeting this target will need to involve the implementation of stringent climate policies and very substantial cutting of greenhouse-gas emissions. Given that there are considerable lags in the earth
Final remarks
There is still a great deal that is not well understood concerning the interactions of climate and increasing climate variability with other drivers of change in livestock systems and in broader development trends. Multiple and competing pressures are likely on tropical and subtropical livestock systems in the future, to produce food, to feed livestock, and to produce energy crops, for example. Livestock and livestock systems are substantial users of natural resources and globally they
Acknowledgements
Large parts of this review are extracted from “The livestock-climate-poverty nexus: A discussion paper on ILRI research in relation to climate change”, Discussion Paper No. 11. ILRI, P.O. Box 30709, Nairobi 00100, Kenya, p. 76, by the same authors, online at http://www.ilri.org/Infoserv/webpub/fulldocs/DiscuPaper11_Climate/Livesto_Climat_Pover_Nexus_DP11.pdf.
Without implicating them in any way, we are grateful to several people at ILRI and elsewhere for help, comments, and suggestions: Alan
References (100)
- et al.
The ‘School of de Wit’ crop growth simulation models: a pedigree and historical overview
Agricultural Systems
(1996) - et al.
Carbon sequestration and farm income in West Africa: identifying best management practices for smallholder agricultural systems in northern Ghana
Ecological Economics
(2008) - et al.
Comparison of the effects of different climate change scenarios on rangeland livestock production
Agricultural Systems
(1993) - et al.
The potential impact of climate change on the Australian wool industry by 2030
Agricultural Systems
(2007) - et al.
The spatial distribution of methane emissions from African domestic ruminants to 2030
Agriculture, Ecosystems and Environment
(2008) - et al.
The potential impacts of climate change in tropical agriculture: the case of maize in Africa and Latin America in 2055
Global Environmental Change
(2003) - et al.
The DSSAT cropping system model
European Journal of Agronomy
(2003) - et al.
An overview of APSIM, a model designed for farming systems simulation
European Journal of Agronomy
(2003) - et al.
Mapping livestock-orientated agricultural production systems for the developing world
Agricultural Systems
(2003) - et al.
An integrated assessment approach to conduct analyses of climate change impacts on whole-farm systems
Environmental Modelling and Software
(2007)
Land use change patterns and livelihood dynamics on the slopes of Mount Kilimanjaro, Tanzania
Agricultural Systems
Linking a population model with an ecosystem model: assessing the impact of land use and climate change on savanna shrub cover dynamics
Ecological Modelling
The temporal dynamics of crop yield responses to climate change in East Africa
Global Environmental Change
Climate change and malaria: analysis of the SRES climate and socio-economic scenarios
Global Environmental Change
Climate change: effects on Culicoides-transmitted viruses and implications for the UK
The Veterinary Journal
Bluetongue confirmed in France. News and reports
Veterinary Record
Grazing systems, ecosystem responses, and global change
Annual Review of Environment and Resources
The Condition of Agricultural Growth: The Economics of Agrarian Change under Population Pressure
Effect of global warming on the distribution of parasitic and other infectious diseases: a review
Journal of the Royal Society of Medicine
Life on the edge: vulnerability and adaptation of African ecosystems to global climate change
Mitigation and Adaptation Strategies for Global Change
Assessing the consequences of climate change for food and forest resources: a view from the IPCC
Climatic Change
The environmental limits to globalization
Conservation Biology
Climate change effects on livestock production in the Great Plains
Future scenarios of livestock systems in developing countries
Dynamic responses of cattle to thermal heat loads
Journal of Animal Science
Climate Change Impacts on Livestock Production and Management
Review: marine ecology – emerging marine diseases – climate links and anthropogenic factors
Science
Ecology – climate warming and disease risks for terrestrial and marine biota
Science
Implications of climate change for grassland in Europe: impacts, adaptations and mitigation options: a review
Grass and Forage Science
Climate proofing agricultural research investments
Journal of SAT Agricultural Research
Modelling energy metabolism of Friesians in Kenya smallholdings shows how heat stress and energy deficit constrain milk yield and cow replacement rate
Animal Science
The potential effects of climate change on summer season dairy cattle milk production and reproduction
Climatic Change
Early effects of climate change: do they include changes in vector-borne disease?
Philosophical Transactions of the Royal Society, London, Series B
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