Chicago Tribune: President Bill Clinton marked Earth Day in 1994 by promising to “green” the White House from its landscaping to its copy machines. But President Barack Obama and his supporters pledged themselves to a far more ambitious goal on Tuesday–combating climate change all over the world. On Capitol Hill, where Democrats command majorities in both houses of Congress, House Democrats began three full days of hearings on a massive energy and climate-change bill, inviting testimony from three …