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Research at the University of Exeter identifying potential climate tipping points and developing early warning methods for them has changed the framework for climate change discussion. Concepts introduced by Professor Tim Lenton and colleagues have infiltrated into climate change discussions among policy-makers, economists, business leaders, the media, and international social welfare organisations. Thorough analyses of abrupt, high impact, and uncertain probability events, including estimates of their proximity, has informed government debate and influenced policy around the world. It has also prompted the insurance and reinsurance industry to reconsider their risk portfolios and take into account tipping point events.
Lived experiences of ordinary people and how they rationalise events provides rich insights for several disciplines e.g. medicine. With climate change, whilst the value of anthropogenic activity is increasingly recognised, models based on positivist scientific rationality still dominate. What is yet unclear is how a global citizenery understands climate change through its own individual and group "lived experiences". This research is significant in that it seeks to conceptualise and theorise what is meant by the "lived experience" of climate change and how this shapes the "lay rationality" and actions of people in both the developed and the developing world.
The United Kingdom is today better adapted to climate risks as a result of a sustained programme of research completed by the School into the impacts of climate change on ecological, social and infrastructural systems. This work has had significant and continuing impact on the design and implementation of UK (and international) climate adaptation strategies and policies, especially with regard to flooding, the built environment and water and coastal management. Decision-support tools (such as climate scenarios and options appraisal) and direct policy advice produced by the School have been used by numerous public and private sector organisations to inform and guide their adaptation strategies and investments.
Information on the potential impacts of climate change across the world, and on the effects of policies designed to reduce emissions, is fundamental to inform the development of climate mitigation and adaptation policy. Research conducted at the Unit has been critical to the establishment of a target 80% cut in UK carbon emissions by 2050, as enforced by the Climate Change Act (2008), and provided an affirmation of the relevance of the 2f0b0C global mean temperature rise target central to national and international climate mitigation policy. Research into the global consequences of climate change, particularly for water resources and river flooding, has been used by the Department for Energy and Climate Change (DECC) to assess the impacts of un-mitigated climate change and the effects of different mitigation policy options.
A comparative methodology to assess the impact of climate change in different countries, implemented by Gosling for a report commissioned by the UK Department of Energy and Climate Change (DECC), informed EU negotiations at the 2011 UN climate change conference in Durban, South Africa. The conference concluded with the Durban Platform for Enhanced Action - a `road map' by which global legal agreement on climate change is to be implemented no later than 2015. For the first time, government ministers and their advisers attending an international conference were able to compare the impact of climate change in different countries, including those where scientific institutions have limited research capacity.
Sussex research has contributed to a shift in public policy away from seeing climate-induced migration as an imminent security, health and public order risk (c.f. the Stern Review) towards an understanding that migration can be an important adaptive response to climate vulnerability. Specifically, reference to migration as a potential adaptation to climate change in Paragraph 14f of the Cancun Agreement of UNFCCC in 2010 reflects the nuanced approach stressed in Sussex research; through their work with GO-Science and DFID, and international organisations including the Global Forum on Migration and Development, UNHCR, IOM and the European Commission, Sussex researchers have contributed to the development and implementation of this paragraph, and to a re-framing of international debates.
Human activity leads to the emission of many greenhouse gases that differ from carbon dioxide (CO2) in their ability to cause climate change. International climate policy requires the use of an "exchange rate" to place emissions of such gases on a "CO2-equivalent" scale. These exchange rates are calculated using "climate emission metrics" (hereafter "metrics") which enable the comparison of the climate effect of the emission of a given gas with emissions of CO2. Research in the Unit has contributed directly to (i) the calculation of inputs required for such metrics, (ii) the compilation of listings of the effects for a large number of gases and (iii) the consideration of alternative metric formulations. During the assessment period this work has been used in the implementation of the first commitment period of the Kyoto Protocol (2008-2012) to the United Nations Framework Convention on Climate Change (UNFCCC), and in decisions and discussions (which began in 2005) on the implementation of the Kyoto Protocol's second commitment period (2013-2020), as well to intergovernmental debate on aspects of the use of metrics in climate agreements.
University of Southampton research has been crucial in informing and stimulating worldwide debate on geoengineering — the possible large-scale intervention in the Earth's climate system in order to avoid dangerous climate change. Climate modellers at Southampton helped to reveal the potential extent of the fossil fuel "hangover" — the long-term damaging effects expected from anthropogenic CO2 emissions centuries or even millennia after they end. This work led Professor John Shepherd FRS to initiate and chair a Royal Society study, whose 2009 report, Geoengineering the Climate: Science, government and uncertainty, is the global benchmark document on geoengineering strategies, influencing UK and foreign government policy.
The US government's announcement of an increase in the `social cost of carbon' (SCC) from $24 to $38 a tonne has been made on the basis of research by Richard Tol, of the University of Sussex. Regulation based on the new SCC (a measure of the damage of releasing an additional tonne of carbon into the atmosphere) initially applies to microwave ovens, where it is anticipated to save US consumers billions on their energy bills over coming decades and prevent 38 million tonnes of CO2 emissions. From June 2013, the new SCC applies to any new or revised regulation by any branch of the US government and will eventually affect a wide range of products and investments, including cars, white goods and power plants.
Tol, who works as an adviser to the US Environmental Protection Agency (EPA), has been instrumental in helping the agency to understand the economic impacts of climate change and the methods and assumptions that underpin SCC estimates. The US government's estimates of the SCC are widely used by other decision-makers in the private sector, banks and NGOs and in other countries.
A novel large-area process-based crop simulation model developed at the University of Reading and published in 2004 has been used to explore how climate change may affect crop production and global food security. The results of Reading's modelling work have been used as evidence to support the case for action on climate change for international agreements and used by the UK Government to inform various areas of policy and, in particular, to help frame its position on climate change at international negotiations. The database and knowledge from this model also informed the development of Reading's innovative web-based tool that locates sites where the climate today is similar to the projected climate in another location - providing insight into potential adaptation practices for crop production in the future by linking to present-day examples. This tool has been used to inform and train farmers and policy-makers in developing countries and has supported policy implementation of the International Treaty on Plant Genetic Resources for Food and Agriculture.