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Temperature
The average global temperature increase since 1750 is 0.8°C. An overall global temperature increase of 2°C is often referred to as the ‘tipping point’ after which global warming could become unstoppable.
An overall temperature rise of 2°C doesn’t sound much. However, the difference in overall world temperature between an ice age and an inter-glacial period is just 4 or 5° C. The five hottest years on record (1998, 2002, 2003, 2004 and 2005) were all within the last decade.
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Useful links
UNEP United Nations Environment Programme – data on temperature trends
NASA 131 years of global warming in a 26 second video clip
Earth Policy Institute Global temperature rise accelerating
BBC Glaciers suffer record shrinkage
Met Office An interactive map showing the likely variations in global temperatures with 4 degrees of warming