This color-coded map shows global surface temperature anomalies. Higher-than-normal temperatures are shown in red, and lower-than-normal temperatures are shown in blue.
The computer models used over the past five decades to predict the impact of future global warming have turned out to be very accurate so far, a new study has found.
Climate scientists at the University of California, Berkeley, Massachusetts Institute of Technology and NASA evaluated climate models from the early 1970s into the late 2000s to see how well they predicted the actual global mean surface temperature, based on levels of carbon dioxide and other greenhouse gases.
They also looked at how well the models matched the relationship between warming and changes in levels of greenhouse gases.
Of the 17 climate projections examined, 14 effectively matched observations after they were published, according to the study published Wednesday in the journal Geophysical Research Letters.
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