National Wildlife Federation president Larry Schweiger claims that trace amounts of CO2 might kill off 70% of the species on Earth

Schweiger starts casually spouting his insane claims at about the 2:20 mark of the video below.

SXSW Eco 2012: The New Environmentalists - YouTube

Time Magazine senior writer Bryan Walsh hosts a conversation with a mix of old and new style environmentalists, for a look at what's next. Featuring 350.org founder Bill McKibben, National Wildlife Federation president Larry Schweiger, and Breakthrough Institute chairman Ted Nordhaus [excerpt].