Published on Monday in the journal Proceedings of the National Academy of Sciences, the study was written by a group of seven academics from Harvard, Stanford and the University of California at San Diego who work in the fields of psychology, business and public policy.

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Data gathering and number crunching for the two-year study was done by Science Applications International Corporation (SAIC), a big government contractor, with input from academics and oil companies like Shell, BP, Marathon Energy.

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