Science Source

Attribution of regional‐scale temperature changes to anthropogenic and natural causes

Determines the causes of twentieth century temperature change in six separate land areas of the Earth by carrying out a series of optimal detection analyses
Detects the warming effects of increasing greenhouse gas concentrations in all the regions examined, including North America and Europe
Finds that, in most regions, cooling from sulfate aerosols counteracts some of the greenhouse warming, and there is some evidence for reduced net aerosol cooling in Asia, possibly as a result of warming from black carbon