In 2000, two sociologists at Washington State University, Aaron McCright and Riley Dunlap, examined all of the writing that conservative think tanks in the U.S. and Canada had published on the subject of climate change. The result of their labors — titled Challenging Global Warming as a Social Problem: An Analysis of the Conservative Movement’s Counter-Claims — was the first comprehensive look at how conservative think tanks were trying to shape the conversation on climate.

Now, in a new study, Constantine Boussalis and Travis G. Coan, political scientists at Trinity College Dublin and the University of Exeter, respectively, have set out to update that information. Sure, you worked hard to discredit climate science in the ’90s, conservative think tanks. But what have you done for us lately?

The conservative think tanks that are now a regular feature of our political scene mostly date back to the early ’70s — the result, so the story goes, of an influential memo written for the U.S. Chamber of Commerce by the corporate lawyer (and later Supreme Court justice) Lewis Powell. Powell argued that a trifecta of labor unions, civil rights groups, and media-savvy social reformers, presided over by “idol of millions” Ralph Nader, had gotten too much power over American media and intellectual life.