In the latest edition of The Undercurrent: environmental activists protest the Smithsonian National Museum of Natural History for having climate-denier-oil-baron David Koch on its advisory board and religious conservative legislators push back on the Pope's findings in his climate change encyclical. Featuring interviews with Sen. Ron Johnson, Rep. Steve King, Gov. Jeb Bush, Gov. John Kasich, Director of The Natural History Museum Beka Economopoulos, and climate expert Joe Romm.