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Since 2005 the Agriculture and Environment Research Unit has undertaken an extensive programme of research related to mitigating the climate change impacts arising from agricultural land management policies and practices. The research findings that identified the impact on climate change of various policies, schemes and farming initiatives have been instrumental since 2008 in providing UK policy makers, farmers and their advisors with data and tools that helped to formulate improved climate change mitigation policies. They also contributed to the development of key guidance materials that supported the implementation of these policies on the farm.
Food security and the sustainable production of food for the human population is a critical issue politically and economically. Benton, Cornell & colleagues have developed and validated a conceptual framework to underpin sustainable agriculture, recognising that land can be specialised to producing food or "ecology" and does not need do both equally everywhere. This challenges current approaches to land management and is influencing the development of new policies for sustainable agriculture (UK, EU, G-20), the food industry's approach to, and public perceptions of, sustainable agriculture. The profile of this work directly contributed to Benton being appointed as the cross-government "Champion" for Global Food Security.
With national and international impact, Home's research on land titling and Islamic land law has helped develop donor aid policy, through UN-Habitat initiatives on post-disaster issues and Islamic land law, and World Bank initiatives on the rule of law in Africa. Impacts of his research within the UK include his contribution to the UK Government's Foresight Land Use Futures Project (2010), and to current policy discussions on future new housing provision. The case study title comes from a well-known story illustrating the legally dubious origins of land ownership in land-grabbing.
NRI's research in Africa has been influential in shifting thinking, policy and practice on customary land tenure and promotion of land tenure security. In particular it has promoted the recognition that customary tenure systems can sometimes provide a high degree of tenure security and do not need to be replaced wholesale, and that a variety of alternative approaches to conventional land titling are available. This led international agencies to develop new approaches and guidelines for land policy and set the stage for a new generation of land tenure projects and programme interventions in Africa, to which NRI is also actively contributing.
Geography at Exeter has a well-established reputation for research on the effects of soil erosion and land management on soil quality, diffuse pollution, and on water quality in UK river systems. Since 2008, this research has been used to inform DEFRA policy, in relation to soils, water, and the DEFRA code of good agricultural practice. Dissemination of effective approaches to land management, most especially through the Catchment Sensitive Farming Initiative has resulted in clearly demonstrable changes in farming practice by landowners in several priority river catchments within the UK, demonstrating a positive change in behaviour and improved management of environmental risk. In addition, research on agricultural erosion has been used in the development of new agricultural policy practices in Canada.
The UN Reducing Emissions from Deforestation and Forest Degradation (REDD+) programme offers developing countries incentives to reduce carbon emissions from forested lands. Work on carbon storage and sequestration led by researchers in the Department of Zoology has had demonstrable impacts on international development, via the REDD+ programme and two associated UN Conventions; Climate Change (UNFCCC) and Biodiversity (UN CBD), and on national level policy development in Tanzania and Brazil. It has improved the quality of data collection and monitoring necessary for successful implementation of REDD+, and has led to international investment. The work has also had direct impacts in a number of developing countries, through capacity building, employment generation, and enabling local communities to better adapt to climate change.
Vincent Gauci and The Open University (OU) Ecosystems Research Group have demonstrated human influences over exchanges of carbon within vulnerable, temperate and tropical wetland ecosystems, which are the largest source of the powerful greenhouse gas methane to the atmosphere. The group's work showing that acid rain pollution suppresses methane emissions from wetlands has influenced policy in the UK, particularly peatland restoration, where the group has had direct interaction with users. The group's work on carbon balance resulting from deforestation, drainage and fires in the carbon-rich Bornean peat swamp has also informed IPCC methodologies for carbon balance calculations in its 2013 Wetlands Supplement.
Meeting rapidly rising food demands at least cost to biodiversity is one of the greatest challenges facing humanity. Since 2005, research in the Department of Zoology has demonstrated that measures to reconcile biodiversity and agricultural production are sometimes best focused on spatial separation (land sparing) rather than integration (land sharing).This work has had a significant impact on policy debate, and has informed policy decisions relating to management of the agri-environment at both national and international levels. Policy statements on increasing food production at least cost to nature now make explicit the potential role that land sparing may have, and place greater emphasis on the need for clear scientific evidence of costs and benefits of different approaches.