Prominent British economist and environmentalist Nicholas Stern, has concluded that the average temperature of the earth could go up as much as about 10 degrees Fahrenheit (5 degrees centigrade) by 2100. He estimates that this rise, to a temperature not see on earth for tens of millions of years, could make much of the planet uninhabitable and rob humanity of a third of its total wealth. He thinks intervening now to forestall this development would cost humanity about 1 percent of annual GDP through 2050.
The original Stern Review is here
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