Roger Pielke Jr. is a professor of environmental studies at the University of Colorado, who focuses on climate policy, sports governance, and the “messy and important place where science and politics collide.” In his fourth appearance on the podcast, (his last appearance was on February 18, 2022), Pielke talks about heat waves, the Iron Law of Climate, Europe’s energy mess, transgender athletes, why “we are treading water” on decarbonization, and why “climate policies have to appeal to everyone.” (Recorded July 25, 2022.)