By 2050, the earth’s population is expected to pass 9 billion. By 2100, climate models predict global temperatures will be on average 4°C warmer and sea levels will be 0.7m higher under “business as usual” conditions. The impacts of such changes have been widely studied and many will be felt within our lifetimes. According to the International Panel on Climate Change’s (IPCC) Fourth Assessment, the impacts will be overwhelmingly negative across the globe, including increased hunger, water stress, flooding, extreme weather, and impacts on biodiversity and human health.
How can we balance the needs for population and economic growth against the needs for environmental stability? The solutions to such a dilemma will require innovative new policy and will challenge the basic assumptions upon which our economy is founded.
What the experts worry about
Food production is intimately linked to the climate. Increased irrigation demands and prolonged droughts are associated with a warmer and less stable climate, and will increase the demand for fresh water. However, fresh water will become less accessible as glacial sources are reduced. Heat stress on crops and livestock is another major and often overlooked factor. Areas of the world specialized in cultivating specific crops may become either unsuitable for those crops or, at least less efficient, especially in areas where localized temperature increases are greater than the global average. Continued acidification of oceans due to absorption of CO2 from the atmosphere will affect marine health. The IPCC’s fifth assessment examined a wide range of regions and crops and found, with high confidence, that the negative impacts of climate change have been more common than positive impacts.
Projected surface temperature changes for early and late 21st century, relative to the period from 1980-1999. AOGCM multi-model average for upper-limit projections (Source:IPCC).
The IPCC projects with very high confidence that climate change will also increase risks from severe weather, particularly for urban populations. These include risks from storms, extreme precipitation, landslides, inland and coastal flooding, droughts and water scarcity. Risks are further increased for those lacking essential infrastructure.
Sea level rise is another major concern. Even a 0.7m sea level rise, the value predicted for the end of the century, could have drastic implications. It has been argued that by 2050, 26 major US cities will face an emerging flooding crisis and the IPCC reports high confidence projections for increased risks from storm surges. Storm surge could cost in the order of trillions by 2100. Many developing countries are more vulnerable and less able to respond to the effects of sea level rise, which, like the effects on agriculture, could add to overall geopolitical instability.
Compared to other regions, Asian countries exhibit the highest population exposed to river flooding; however, developed regions, particularly Miami, New York, New Orleans, Osaka-Kobe, Tokyo, and Amsterdam, are among the most exposed to flooding interms of assets.
Lastly, long-term prospects for sea level rise become much worse when looking beyond the end of the century. Even if the world succeeds in stabilizing global warming to the 2°C targeted by current climate negotiations, sea level rise could continue well beyond the 0.7m value predicted for the end of the century. Complex feedback processes between the world’s oceans, the climate, and the ice sheets themselves could facilitate continued melting and ultimately lead to rises as great as 6m.
U.S. Global Change Research Program (USGCRP): A US Government research program that seeks to assist the Nation and the world to understand, assess, predict, and respond to human-induced and natural processes of global change.
World Bank: Climate Change: Information on projects, programs, research, news items related to climate change provided by the World Bank
European Environment Agency): EU agency source for those involved in developing, adopting, implementing and evaluating environmental policy, and also the general public
MIT Center for Global Change Science): Adresses fundamental questions about climate processes with a multidisciplinary approach and aims to improve the ability to accurately predict changes in the global environment
UK Climate Impacts Programme (UKCIP): University of Oxford Climate Institure to partner world-leading academics working on critical climate change issues http://www.ucsusa.org/global_warming/ Union of Concerned Scientists
Climate Central: An independent organization of leading scientists and journalists researching and reporting the facts about our changing climate and its impact on the American public.
Many of the organizations listed on this page and their descriptions are from a list compiled by the Global Catastrophic Risk institute; we are most grateful for the efforts that they have put into compiling it. These organizations above all work on environmental issues, though many cover other topics as well. This list is undoubtedly incomplete; please contact us to suggest additions or corrections.
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