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Climate Change

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.
November 15, 2015
Ariel Conn


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Climate change is a huge problem, and it absolutely needs to be solved.
Bill Gates, Co-founder of Microsoft and the Gates Foundation

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 Intergovernmental 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; meanwhile, Miami, New York, New Orleans, Osaka-Kobe, Tokyo, and Amsterdam, are among the most exposed to flooding in terms 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.

Population exposed (left) and assets exposed (right) to sea-level rise, storm surge and subsidence by country. (Source: Ranking Port Cities: Exposure Estimates)

Recommended References



Research Papers


Many of the organizations listed on this page and their descriptions are from a list compiled by the Global Catastrophic Risk Institute (GCRI); 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.

This content was first published at on November 15, 2015.

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