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Global warming could make the average person 40% poorer by 2100

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Just 4C of warming will make the average person 40% poorer by 2100 .

Global GDP per person - a measure of economic output - will fall by 16% .

This is a huge increase from more conservative estimates, which suggested 2C (3.6F) of warming would lead to a 1.4% decrease in GDP.

The researchers have taken the impact of global weather into account for the first time.