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It\u2019s a record we didn\u2019t want to break. The carbon dioxide concentration in the atmosphere hits the 400 parts-per-million mark, a level which some scientists say is a point of no return for stopping climate change. A few days later, a leading newspaper prints an op-ed essay that claims CO2 is getting a bad rap: it\u2019s actually good for the planet. The more the better.\nSkeptic Phil Plait rebuts the CO2-is-awesome idea while a paleontologist paints a picture of what Earth was like when the notorious gas last ruled the planet. Note: humans weren\u2019t around.\nPlus, our skit says NO to O2 \u2026 and a claim that climate change skeptics have borrowed from the Creationists\u2019 playbook in challenging the teaching of established science in schools.\nGuests:\n\n\nPhil Plait \u2013 Astronomer, skeptic, and author of Slate Magazine\u2019s blog Bad Astronomy\n\n\n\nPeter Ward \u2013 Paleontologist and biologist, Department of Earth and Space Sciences, University of Washington in Seattle\n\n\nJosh Rosenau \u2013 Programs and Policy Director at the National Center for Science Education\n\n\nEugenie Scott \u2013 Executive Director of the National Center for Science Education\n\nDescripci\xf3n en espa\xf1ol\nLearn more about your ad choices. Visit megaphone.fm/adchoices