Organizers are calling Step it Up 2007 the largest day of action on global warming in the history of the United States. In New York, participants will outline a new high tide mark with their bodies. In Berkeley, they’ll have a bicycle rally. In San Francisco, a clean-car expo. And when the dust settles, they’ll all be sending photos of themselves to Congress. KPFA’s Brian Edwards-Tiekert and Sandra Lupien bring you live coverage of the action in the streets and the situation in the halls of power.