The Advertising Council, in partnership with Environmental Defense Fund and Ogilvy & Mather, announced the launch of a new series of broadcast and online viral public service announcements (PSAs) designed to urge Americans to take advantage of mass transit, carpooling and biking to combat global warming. Discovery Communications' new environmentally focused Planet Green channel will air the PSAs, as well as the network's companion online properties, planetgreen.com and treehugger.com.