Tag Archives: Mario Herrero

Greener pastures and better breeds could reduce carbon ‘hoofprint’

Posted on by
Reply

Baoshan Community Dairy Feeding Centre

Cows at the Boashan Community Dairy Feeding Centre, in Yunnan Province, China (photo credit: ILRI / Mann).

A new study by the International Livestock Research Institute (ILRI) finds reductions in greenhouse gasses could be worth a billion dollars to poor livestock farmers if they could sell saved carbon on international markets.

Greenhouse gas emissions caused by livestock operations in tropical countries—a major contributor to climate change—could be cut significantly by changing diets and breeds and improving degraded lands, according to a new study published today in the U.S. Proceedings of the National Academy of Sciences. And as an added bonus, scientists found the small changes in production practices could provide a big payoff by providing poor farmers with up to US$1.3 billion annually in payments for carbon offsets.

'These technologically straightforward steps in livestock management could have a meaningful effect on greenhouse gas build-up, while simultaneously generating income for poor farmers,' said Philip Thornton, of ILRI, who co-authored the paper with ILRI’s Mario Herrero.  

Livestock enterprises contribute about 18% of the world’s greenhouse gases, largely through deforestation to make room for livestock grazing and feed crops, the methane ruminant animals give off, and the nitrous oxide emitted by manure. Many worry these greenhouse gas emissions could grow due to increased livestock production to meet surging demand for meat and milk in developing countries.

Thornton and Herrero believe there are options readily available to prevent up to 417 million tons of carbon dioxide expected to be produced by livestock in tropical countries by 2030—a sum representing a savings of about 7% of all livestock-related global greenhouse gas emissions.

'Of course,' says Thornton, 'if we also manage to bring down consumption of meat and milk in rich countries, the amount of carbon saved will be even greater.' The difference between livestock production in rich and poor countries is a big concern to Thornton. 'We conducted this study to try to disentangle some of the complexities surrounding livestock systems, particularly those in developing countries. Livestock systems are not all the same, and there are large differences in their carbon footprint, their importance for the poor, and their mitigation potential.'

Most reductions of livestock-produced greenhouse gases would have to come from the more than half a billion livestock keepers in tropical countries. But the study finds that these struggling farmers could be motivated to adopt more climate-friendly practices.

'It would be a useful incentive if these farmers were allowed to sell the reductions they achieve as credits on global carbon markets,' Thornton said. 'We found that at US$20 per ton—which is what carbon was trading for last week on the European Climate Exchange—poor livestock keepers in tropical countries could generate about US$1.3 billion each year in carbon revenues.' Although carbon payments would not amount to a lot more income for each individual farmer (such payments might represent an increase in individual income of up to 15%), such payments should provide a tipping point for many smallholders considering intensifying their livestock production.

According to the ILRI study, livestock-related greenhouse gas reductions could be quickly achieved in tropical countries by modifying production practices, such as switching to more nutritious pasture grasses, supplementing diets with even small amounts of crop residues or grains, restoring degraded grazing lands, planting trees that both trap carbon and produce leaves that cows can eat, and adopting more productive breeds.

'We wanted to consider the impact in tropical countries because they are at the epicentre of a livestock revolution,' said Herrero. 'We expect consumption of milk and meat to roughly double in the developing world by 2050, which means it’s critical to adopt sustainable approaches now that contain and reduce the negative effects of livestock production, while allowing countries to realize the benefits, such as better nutrition and higher incomes for livestock-producing households.'

Herrero and Thornton said that changing diets and breeds could increase the amount of milk and meat produced by individual animals, thus reducing emissions because farmers would require fewer animals. For example, in Latin America, they note that switching cows from natural grasslands to pastures sown with a more nutritious grass called Brachiaria can increase daily milk production and weight gain by up to three-fold. This increase, they said, means fewer animals are needed to satisfy demand. In addition, Brachiaria also absorbs, or 'sequesters,' more carbon than degraded natural grasslands.

'Even if only about 30% of livestock owners in the region switch from natural grass to Brachiaria, which is what we consider a plausible adoption rate, that alone could reduce carbon dioxide emissions by about 30 million tons per year,' Thornton said.

Herrero and Thornton also said that, for a given level of demand, fewer animals would be needed if more farmers supplemented grazing with feed consisting of crop residues (often called 'stover'), such as the leaves and stalks of sorghum or maize plants, or with grains. In addition, they note there is the potential to boost production per animal by crossbreeding local with genetically improved breeds, the latter of which can provide more milk and meat than traditional breeds while emitting less methane per kilo of meat or milk produced.

Planting trees that have agricultural and feed uses, a practice known as 'agroforestry,' has the benefit of reducing feed costs for animals, while the trees themselves absorb carbon. Herrero and Thornton found that of the 33 million tons of carbon dioxide that could be reduced through wider use of agroforestry in livestock operations, almost two-thirds of it—72%—would come from the 'carbon sequestration' effects of the trees.

Carols Seré, ILRI’s Director General, said Thornton and Herrero’s work usefully steers the discussion of livestock’s contribution to climate change from blunt criticism of the impact of farm animals to meaningful efforts to address the environmental consequences of their increased production.

'There is a tendency today to simply demonize livestock as a cause of climate change without considering their importance, particularly for poor farmers in the developing world,' Seré said.

'Most of the farmers we work with have a relatively small environmental footprint,' he added, 'and they are intensely dependent on their animals for food, for income, and even as "engines" to plough their fields and transport their crops. What these farmers need are technological options and economic incentives that help them intensify their production in sustainable ways. Carbon payments would be a welcome additional incentive inducing such changes in smallholder livestock production.'

Key messages from the publication
(1) The impact of any given livestock intervention on mitigating total greenhouse gas emissions will be small.
To make a difference, we will need to implement many interventions and do so simultaneously. Mitigating the impacts of livestock systems on climate change will require taking a series of small incremental steps and implementing a wide range of different mitigation strategies to reduce carbon dioxide, methane and nitrous oxide emissions.

(2) We should aim for fewer, better fed, farm and herd animals.
Apart from strategies to sequester greater amounts of carbon, all strategies for mitigating greenhouse gases appear to require the intensification of animal diets and a reduction in animal numbers to produce the same volume of meat and milk.

(3) Ways to mitigate greenhouse gases in tropical livestock systems are technologically straightforward.
Apart from strategies to sequester carbon, all strategies for mitigating greenhouse gas emissions tested could be implemented at farm level with the appropriate economic and other incentives for resource-poor farmers.

(4) GHG mitigation strategies can be pro-poor.
Paying small-scale livestock farmers and herders for practices that help sequester carbon (under REDD or similar incentive schemes), although not trivial in management terms, would help smallholders generate greater and more diversified incomes.

(5) Mitigation strategies can also support strategies to help smallholders adapt to climate change.
Some interventions aiming to reduce greenhouse gases will also serve to help people cope with more unpredictable and extreme weather.

(6) All strategies will need to include appropriate incentives for smallholders.
A major incentive for small-scale livestock producers to change their production practices will be the increasing demand for livestock products in developing countries. But many smallholders will also need other economic incentives and more user-friendly technologies in order to make even straightforward changes in their production practices. 

Read the whole paper at the Proceedings of the National Academy of Sciences: The potential for reduced methane and carbon dioxide emissions from livestock and pasture management in the tropics, 6 September 2010.

Meat/milk/eggs: Who should reduce—and who should increase—their consumption to slow global warming

Posted on by
Reply

Agricultural systems analyst Mario Herrero (Cost Rica), based at the Nairobi, Kenya, campus of the International Livestock Research Institute (ILRI), this July-August 2010 hosted a 'write-shop cum think tank' session with a group of leading world experts on the topic of food systems, particularly those involving meat, milk and eggs, and climate change.

Eight short filmed interviews of 4 of these experts on the following topics are posted on www.ilri.blip.tv. Click on the links below to view the interviews.

(1) From cows to camels: adapting to Africa’s drying climates
Ilona Glücks: Vétérinaires sans frontières (VSF), Switzerland

Many of Africa’s grazing lands are becoming drier with climate change. Some pastoral communities that have traditionally herded cattle, sheep and goats across these lands are switching to camels. Camels produce milk for longer than cattle, maintaining production even during prolonged dry seasons and droughts. Researchers expect that camels will become increasingly common and important to the economic and nutritional well-being of Africa’s pastoral households.

(2) Will deforestation remain the biggest driver of human-induced global warming?
Michael Obersteiner: International Institute for Applied Systems Analysis (IIASA), Austria

Deforestation historically has been the largest producer of human-generated greenhouse gases. Recent experience suggests that global deforestation trends can be reversed. Since 2002, for example, Brazil has virtually stopped the clearing of forests on a massive scale to make room for livestock grazing.

(3) We can reduce global warming through our food chains
Tara Garnett: Food Climate Research Network, University of Surrey, UK

Significant amounts of greenhouse gas produced by humans are generated by the growing, processing, distribution and sale of food. Much can be done to reduce the levels of greenhouse gases in our food chains.

(4) We need to find equitable ways to reduce greenhouse gases
Tara Garnett: Food Climate Research Network, University of Surrey, UK

Scientists report that we need to reduce our greenhouse gas emissions by up to 80 per cent by 2050. Research shows ways to reduce emissions from the agricultural sector, which generates a large amount of the carbon dioxide and other greenhouse gases produced by humans. Policies to support such reductions must to take into account the different needs and circumstances of developed and developing nations. 

(5) Will vegetarianism reduce global warming?
Tara Garnett: Food Climate Research Network, University of Surrey, UK

While changes need to be made to address growing problems of obesity and diet-based ill health in rich countries, animal products will remain vital to the nutrition of poor people in poor countries, where consumption of milk, meat and eggs is about a tenth the rate of that in rich countries. Whole populations becoming vegetarian or vegan will help neither the overfed nor underfed. 

(6) How much land should be converted from foods to bio-fuels?
Tim Searchinger: Princeton University, USA

With land becoming increasingly scarce, converting lots of farms to grow crops for bio-fuels rather than food could reduce our food supplies and drive up food prices. Most of the world’s arable land now being used to grow food should not be converted for bio-fuel production. Rather, unused lands and non-food crops or waste biomass (e.g., inedible cereal stalks) should be sought for bio-fuel production.

(7) Should we curtail livestock or biofuel production to slow global warming?
Tim Searchinger: Princeton University, USA

Livestock enterprises today produce more greenhouse gases than the production of fuels derived from biomass; that’s because livestock keeping is still so much more common than bio-fuel production. But policies to curtail livestock production in poor countries would harm the poor. Livestock are the nutritional and economic mainstay of some one billion poor people today, and are likely only to increase in importance as the global human population grows to more than 9 billion by mid-century. 

(8) Will we ever run our cars on bio-fuels?
Tim Searchinger: Princeton University, USA

One day we will probably grow enough bio-fuels to power airplanes. It is unlikely, however, that we shall ever produce bio-fuels at scales sufficiently large to replace petrol for our cars.

Livestock background paper for World Development Report 2010: Development in a changing climate

Posted on by
Reply

Household takes refuge from the rain in central Malawi

Household takes refuge from the rain in central Malawi (photo by ILRI/Mann).

A paper on livestock and climate change—'The inter-linkages between rapid growth in livestock production, climate change, and the impacts on water resources, land use, and deforestation'—was prepared as a background paper to the World Bank’s acclaimed World Development Report 2010: Development in a Changing Climate. It was written by two agricultural systems analysts at the International Livestock Research Institute (ILRI), Philip Thornton and Mario Herrero.

The following is the abstract to the paper.

'Livestock systems globally are changing rapidly in response to human population growth, urbanization, and growing incomes. This paper discusses the linkages between burgeoning demand for livestock products, growth in livestock production, and the impacts this may have on natural resources, and how these may both affect and be affected by climate change in the coming decades.

'Water and land scarcity will increasingly have the potential to constrain food production growth, with adverse impacts on food security and human well-being. Climate change will exacerbate many of these trends, with direct effects on agricultural yields, water availability, and production risk.

'In the transition to a carbon-constrained economy, livestock systems will have a key role to play in mitigating future emissions. At the same time, appropriate pricing of greenhouse gas emissions will modify livestock production costs and patterns. Health and ethical considerations can also be expected to play an increasing role in modifying consumption patterns of livestock products, particularly in more developed countries.

'Livestock systems are heterogeneous, and a highly differentiated approach needs to be taken to assessing impacts and options, particularly as they affect the resource-poor and those vulnerable to global change. Development of comprehensive frameworks that can be used for assessing impacts and analyzing trade-offs at both local and regional levels is needed for identifying and targeting production practices and policies that are locally appropriate and can contribute to environmental sustainability, poverty alleviation, and economic development.'

About the World Development Report 2010:
'Today's enormous development challenges are complicated by the reality of climate change─the two are inextricably linked and together demand immediate attention. Climate change threatens all countries, but particularly developing ones. Understanding what climate change means for development policy is the central aim of the World Development Report 2010.

'Estimates are that developing countries would bear some 75 to 80 percent of the costs of anticipated damages caused by the changing climate. Developing countries simply cannot afford to ignore climate change, nor can they focus on adaptation alone. So action to reduce vulnerability and lay the groundwork for a transition to low-carbon growth paths is imperative.

'The World Development Report 2010 explores how public policy can change to better help people cope with new or worsened risks, how land and water management must adapt to better protect a threatened natural environment while feeding an expanding and more prosperous population, and how energy systems will need to be transformed.

'The authors examine how to integrate development realities into climate policy─in international agreements, in instruments to generate carbon finance, and in steps to promote innovation and the diffusion of new technologies.

'The World Development Report 2010 is an urgent call for action, both for developing countries who are striving to ensure policies are adapted to the realities and dangers of a hotter planet, and for high-income countries who need to undertake ambitious mitigation while supporting developing countries efforts.

'The authors argue that a climate-smart world is within reach if we act now to tackle the substantial inertia in the climate, in infrastructure, and in behaviors and institutions; if we act together to reconcile needed growth with prudent and affordable development choices; and if we act differently by investing in the needed energy revolution and taking the steps required to adapt to a rapidly changing planet.'

Read more of ILRI livestock background paper: World Bank Policy Research Working Paper, 'The inter-linkages between rapid growth in livestock production, climate change, and the impacts on water resources, land use, and deforestation', 2010, by Philip Thornton and Mario Herrero.

Improving African food security in the face of climate change

Posted on by
Reply

ILRI FANRPAN dialog meeting display

Scientists, policymakers and farmers from across Africa are meeting this week in Windhoek, Namibia to discuss how to improve food security in Africa in the face of climate change. (Photo credit: ILRI/Stevie Mann) 

The International Livestock Research Institute (ILRI) is this week joining over 200 policymakers, farmers, agricultural product dealers, scientists and non-governmental organizations from across Africa in Windhoek, Namibia, in a week-long Regional Food Security Policy Dialogue organized by the Food, Agriculture and Natural Resources Policy Analysis Network (FANRPAN). This year’s dialogue focuses on African priorities for food security and climate change and the impacts of climate change on agricultural development, natural resource management and rural livelihoods.

ILRI agricultural systems analyst Mario Herrero and Siboniso Moyo, ILRI representative for southern Africa, are attending this conference, which runs from 30 August to 3 September 2010. The participants are examining ways of helping over 265 million people on the continent overcome chronic hunger.

Lindiwe Sibanda, Chief Executive Officer of the Food, Agriculture and Natural Resource Policy Analysis Network and member of ILRI’s Board of Trustees, says, ‘Africa’s challenges include stagnant agricultural productivity; limited access to agricultural inputs, water, markets and knowledge. And increasingly, we must also cope with more extreme and erratic weather (floods and droughts), soil salinity and unpredictable rainfall, and the effects of such climate change on agricultural production.’

Because agriculture, including livestock farming, still holds the greatest potential to boost rural livelihoods, reduce poverty and spur growth in other sectors in the continent, forums such as this are needed to pull together high-quality, evidenced-based, information and knowledge that can benefit Africa’s poorest people, most of whom are women who rely on agriculture for their livelihoods.

With 60 percent of the world's uncultivated arable land, Africa's agricultural sector has potential to feed its own people and grow to a US$880 billion industry if the right production strategies and methods are used to increase production.

‘To achieve this’, said Sibanda, ‘agricultural tools and knowledge must be made accessible to farmers to increase their yields and adapt to new climate scenarios. Africa needs its own agricultural revolution, one built on technology and innovation and facilitated by a conducive policy environment aligned with the needs of African farmers.’

The Food, Agriculture and Natural Resource Policy Analysis Network works in 13 African countries, encouraging government and civil society to work together in support of demand-driven agricultural policy research and analysis.

For more coverage of the 2010 dialogue, visit: 
http://www.guardian.co.uk/katine/katine-chronicles-blog/2010/aug/24/africa-katine-farming and http://www.alertnet.org/db/blogs/66102/2010/07/26-152915-1.htm

To find out more about ILRI's presentation during the meeting (by Mario Herrero) please visit: http://www.slideshare.net/ILRI/fanrpan-policy-meetings-sept-2010 and http://africa.ipsterraviva.net/2010/09/01/agriculture-in-africa-is-changing-rapidly/.

For information about the Food, Agriculture and Natural Resource Policy Analysis Network, see http://www.fanrpan.org/

Livestock goods and bads: Filmed highlights of ILRI’s 2010 Annual Program Meeting

Posted on by
Reply

At the 2010 Annual Program Meeting (APM) of the International Livestock Research Institute (ILRI), held in April in Addis Ababa, Ethiopia, several hundred participants debated and discussed the challenges facing the global livestock industry. ILRI and its partners are investigating ways to promote smallholder participation in livestock markets, more sustainable ways for livestock keepers to use natural resources, and ways to improve livestock pathways out of poverty.

Some of the presentations made during the meeting on the theme of 'Livestock: the Good, the Bad and the Gaps' were captured on film. We share three of those below.

The first film is a presentation by ILRI agricultural systems analyst Mario Herrero on the important place of livestock for smallholder farmers in developing economies. Herrero highlights the many benefits livestock bring to the rural poor and argues that the rapidly expanding sector will need to be better managed and to reduce the environmental risks it poses if it is to continue to be productive. Herrero argues for an integrated assessment of the effects of the global livestock industry on various agro-ecosystems important to the poor.

In the second film, ILRI veterinary and food safety researcher Delia Grace discusses the human health risks associated with livestock keeping. Grace notes that zoonotic diseases (those transmitted between animals and people) and emerging infectious diseases (such as bird flu) are two of the well-known risks associated with livestock. But she says that animals provide a means of regulating diseases because they can serve as sentinels that lets communities and public health officials know of disease outbreaks before the diseases can affect humans. She makes the case for more research to address the many common misconceptions that exist about livestock and human health.

In the third film, Narayan Hedge, of India's BAIF Development Research Foundation, highlights the important role livestock play in providing a livelihood for nearly 700 million people in India. He makes an appeal for better livestock technologies, better infrastructure, and more efficient management of the industry so that more smallholder farmers can use livestock to escape poverty.

Livestock goods and bads: Background and evidence

Posted on by
Reply

On Thursday 15 April, ILRI staff, Board members and partners gather in Addis Ababa for the first day of the annual program meeting. The first major plenary session mobilizes a range of speakers on different dimensions of the ‘goods and bads’ issue. The presentations are online:

See a short video interview with IFPRI’s David Spielman in livestock research priorities.

We also asked leaders of ILRI research groups to briefly present what each is doing in terms of livestock goods and bads, and which research gaps need to be filled.

Livestock goods and bads: Perspectives from ILRI research

View more presentations from ILRI CGIAR.

This post is part of a series associated with the ILRI Annual Program Meeting in Addis Ababa, April 2010. More postings …

New paper quantifies the global role of livestock as a nutrient source for the first time

Posted on by
Reply

Mario Herrero, systems analyst at the Africa-based International Livestock Research Institute (ILRI), is co-author of a paper to be published today in the prestigious US Proceedings of the National Academy of Sciences (PNAS). The paper quantifies the role of livestock as a nutrient source globally for the first time. The paper, ‘A high-resolution assessment on global nitrogen flows in cropland’, reports results of an investigation of the sources of nitrogen for crop production globally. ‘We quantified the role of manure in different continents and in different agricultural production systems,’ says Herrero. ‘We found large differences in manure levels. In large parts of Africa and South Asia, which have the greatest numbers of poor people in the world, most of whom make a living by farming, manure can represent 35-40% of the nitrogen needed for growing crops, making it a major source of needed nutrients in these regions,’ Herrero. Elsewhere, he explained, where farmers have ready access to chemical fertilizers, manure plays a less important role in crop production. The paper shows that livestock manure is as important a nutrient contributor as (and in some regions, is even more important than) the stalks, leaves and other wastes of crops after harvesting, which are often fed back into soils to help enrich them for the next cropping season. But those crop residues are becoming increasingly scarce due to their competitive uses. And one of the biggest competitive uses is as animal feed. Many farmers are loath to put their crop residues back into their soils because they need them to feed their animals. In South Asia and sub-Saharan Africa, crop wastes represent between 40 and 60% of all the feed for the cattle, sheep, goats and other ruminant animals raised. ‘Crop residues are a hugely important resource,’ says Herrero. ‘And needing to keep these resources to feed their animals stops many farmers from adopting conservation agriculture, which requires putting the residues back into the ground.’ Of course, the animals consuming crop residues deposit their manure on the ground. This analysis by Hererro and colleagues suggests that, globally speaking, livestock manure and crop residues make similar levels of contributions to nutrient levels. ‘In developing countries,’ he says, ‘the best solution is often for a farmer to feed her crop residues to her ruminant animals and then fertilize her soils with the manure they produce.’ That’s because these farm animals provide poor farmers with many other essentials as well, including highly nourishing animal-source foods for the household, much-needed year-round cash incomes, and draught power, transport and other inputs for successful cropping. ‘The bad news,’ says Herrero, ‘is that the amount of manure we have in Africa and South Asia is not nearly enough to increase levels of crop production. And to feed the world’s growing human populations, we’re going to have to increase the amount of nutrients we’re providing the soils in these regions.’

Animal agriculture can help sustain the new ‘food frontiers’ that should feed the world’s growing populations

Posted on by
Reply

Evolution of Uganda's dairy systems

Voice of America reported yesterday (‘Regulation Can’t Keep Pace with Livestock’, 22 Feb 2010) that the UN Food and Agriculture Organization (FAO) says that ‘livestock production is growing faster than our capacity to safely manage it’. A new FAO report, The State of Food and Agriculture, underscores the importance of supporting the world’s one billion poor people who depend on livestock to make their living.

What poor animal keepers need, say scientists at the International Livestock Research Institute (ILRI), is a ‘third way’ of producing milk, meat and eggs that copies neither harmful industrial-scale factory farming of animals in rich countries nor inefficient subsistence-level practices currently used to wrest a living off marginal lands in poor countries. ILRI staff argue, most recently in the world’s leading science journal, Science (‘Smart Investments in Sustainable Food Production: Revisiting Mixed Crop-Livestock Systems’, 12 Feb 2010), that more sustainable animal agriculture is particularly needed in developing countries, where livestock production is growing fast, natural resources are being degraded and lost, and small-scale mixed crop-and-livestock farmers are already feeding most of the world’s poor people. The authors of the Science paper, who come from ILRI and other centres of the Consultative Group on International Agricultural Research (CGIAR), also see this ‘third way’ of livestock production as particularly vital for the new ‘food frontiers’ of the world. These, they say, are the many farmlands currently being used to raise animals as well as to produce maize, rice and other major food crops that lie between the high- and low-potential agricultural lands of developing countries.

‘It is these relatively extensive medium-potential mixed-production farmlands that have been neglected until now,’ says lead author and ILRI scientist Mario Herrero, ‘that should now be the focus of agricultural development policymakers and aid agencies. These are the lands that are key to feeding the world’s extra 3 billion people over the next 4 decades. Click here for the Voice of America news item about the FAO study. Click here to read the Science paper by ILRI and other CGIAR researchers on the import of mixed and extensive crop-livestock farming for food security.

ILRI study published today in Science special issue on food security

Posted on by
Reply

A paper written by several centres of the Consultative Group on International Agricultural Research (CGIAR), Smart Investments in Sustainable Food Production: Revisiting Mixed Crop-Livestock Systems, is published in the current issue (12 February 2010: Vol. 327. no. 5967, pp. 822–825) of Science magazine. The paper argues that the world's small-scale mixed crop-and-livestock farmers are the farmers feeding most of the world's poor today, are the farmers likely to feed most of the world's growing poor populations tomorrow, and are the farmers most neglected by current investments and policies worldwide. Lead author Mario Herrero, an agricultural systems analyst at the International Livestock Research Institute (ILRI), says that with the right investments and policy support, the 'relatively extensive' mixed crop-livestock farming systems – located in most tropical developing regions of the world between intensively farmed fertile highlands and semi-arid low rangelands – could be the future breadbaskets of the developing world. The abstract of the paper follows. Smart Investments in Sustainable Food Production: Revisiting Mixed Crop-Livestock Systems M. Herrero P. K. Thornton, A. M. Notenbaert, S. Wood, S. Msangi, H. A. Freeman, D. Bossio, J. Dixon, M. Peters, J. van de Steeg, J. Lynam, P. Parthasarathy Rao, S. Macmillan, B. Gerard, J. McDermott, C. Seré, M. Rosegrant Farmers in mixed crop-livestock systems produce about half of the world’s food. In small holdings around the world, livestock are reared mostly on grass, browse, and nonfood biomass from maize, millet, rice and sorghum crops, and in their turn supply manure and traction for future crops. Animals act as insurance against hard times and supply farmers with a source of regular income from sales of milk, eggs and other products. Thus, faced with population growth and climate change, small-holder farmers should be the first target for policies to intensify production by carefully managed inputs of fertilizer, water and feed to minimize waste and environmental impact, supported by improved access to markets, new varieties and technologies. Read the full text