Global doom has not been ruled out

摘要

HEADLINES last week proclaimed the worst-case scenarios for climate change were "debunked" and "not credible". As you might expect, things aren't that simple. The stories were sparked by a study by Peter Cox at the University of Exeter, UK, and his colleagues, who attempted to work out how much warming will result from a given increase in carbon dioxide levels, Specifically, if we doubled CO_2 levels in the atmosphere and waited for the temperature to stabilise, how much would the world warm?