In his two and a half years in the U.S. Senate, Barack Obama has been active — even hyperactive — on matters of energy and the environment. The Democrat from Illinois has introduced or cosponsored nearly 100 eco-related bills on issues ranging from lead poisoning and mercury emissions to auto fuel economy and biofuels promotion. Along the way, he’s racked up a notable 96 percent rating from the League of Conservation Voters. [Update: In February 2008, Obama's lifetime LCV score was changed to 86 -- lower than before because he missed some key votes while on the road campaigning.]
