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Brexit economics

Climate change

Why is a deal necessary?

In December 2015, representatives of 195 countries attended the Paris climate-change conference (COP 21) to discuss how to tackle global warming. John Sloman explores the economics of climate change and why it is important to reach a deal

climate change, market failure, externalities, environmental policy

Climatologists and other scientists generally agree that the global climate is getting warmer. Levels of carbon dioxide from the burning of fossil fuels have risen along with other greenhouse gases, such as methane from dairy farming and paddy fields. The list of consequences of climate change is extensive and includes the shrinking of the polar ice caps, rising sea levels, increased droughts and extreme weather events, the acidification of oceans and the destruction of coral reefs. Warming increases water vapour in the atmosphere — itself a powerful greenhouse gas.

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