climate change projections

The Intergovernmental Panel on Climate Change (IPPC, 2007) predicted an increase in average global temperature by the end of the 21stC, above the 1980–1999 level, of between 1.1oC and 6.4oC (with greater increases on land and in polar regions), depending on future greenhouse gas emissions. At the time of writing (2012), greenhouse gas emissions approximate to the worst case projection of the IPCC. On current trends emissions would double from 2009 to 2050, leading to a long-term global temperature increase of about 6oC.

This definition is abridged from A – Z of tree terms: A companion to British arboriculture.
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