Devil In The Details: Is Copenhagens 2 ºC Guardrail Obsolete?
Green Car Congress
DECEMBER 16, 2009
A maximum concentration of 450 ppm carbon dioxide (~550 ppm CO 2 equivalent) in the Earth’s atmosphere is commonly cited as the limit at which average temperatures can be held at 2 ºC, and many emissions reduction proposals are based upon these two “upper bounds” targets. ºF) above pre-industrial temperatures. Not the last two days.”.
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