Climate change milestone
May 21, 2013
Guests: Gavin Schmidt, Anthony Leiserowitz
Last week carbon dioxide in the atmosphere reached record levels — 400 parts per million, according to a monitoring station in Hawaii.Â Never in human history have carbon dioxide concentrations been that high.Â Scientists have warned that these high levels mark a milestone in our climate and could alter it significant ways. Â This hour, have we reached a climate tipping point?Â Weâ€™ll also check in on Americanâ€™s attitudes toward climate change. Â Marty talks with GAVIN SCHMIDT, climate scientist at the NASA Goddard Institute for Space Studies, and ANTHONY LEISEROWITZ, Director of the Yale Project on Climate Change Communication.