21 Jan '12, 1pm

A Comprehensive Review Of What's Causing Global Warming

A Comprehensive Review Of What's Causing Global Warming

Tett et al. applied their model to global surface temperatures from 1897 to 1997. Their best estimate matched the overall global warming during this period very well; however, it underestimated the warming from 1897 to 1947, and overestimated the warming from 1947 to 1997. For this reason, during the most recent 50 year period in their study (shown in dark blue in Figure 1), the sum of their natural and human global warming contributions is larger than 100%, since their model shows more warming than observed over that period. Over both the 50 and 100 year timeframes, Tett et al. estimated that natural factors have had a slight net cooling effect, and thus human factors have caused more than 100% of the observed global warming.

Full article: http://www.treehugger.com/climate-change/comprehensive-re...

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