Lindzen was a featured speaker at a Cato Institute conference, “Global Environmental Crisis: Science or Politics?” on June 5 (World Environment Day) and June 6, 1991. The conference was identified in 2019 in the book "Kochland" by business writer Christopher Leonard as a previously unhighlighted early landmark in the efforts by the fossil fuel multi-billionaire Koch brothers to promote questions about climate science. Cato Institute was “founded and heavily funded for years” by the Kochs, and Lindzen was prominently quoted in the brochure for the conference.