Check out the alarmist 3-minute trailer for "Heat"

FRONTLINE: coming soon: heat | PBS

Melting glaciers, rising sea levels, fires, floods and droughts. On the eve of a historic election, award-winning producer and correspondent Martin Smith investigates how the world's largest corporations and governments are responding to Earth's looming environmental disaster. HEAT , part of "PBS Vote 2008" election coverage, confronts the defining story of our time in a two-hour FRONTLINE investigation airing Tuesday, Oct. 21, 2008, from 9 to 11 P.M. ET on PBS