Join a 30-minute online chat about black carbon with Martin Wagner, head of Earthjustice’s global warming work, this Tuesday (Oct. 20) at 11 a.m. Pacific Time. You can do it on your personal computer at home or at work. For details and to register, go to this website.

Black carbon—sent aloft in the smoke streams from cooking fires, factories and such industrial equipment as diesel trucks and generators—settles on glaciers and in the Arctic, warming and melting the ice. It is considered one of the worst climate change pollutants, and one of the easiest to deal with.