Barack Obama's excellent global warming hoax adventure: He was against it, then he was for it, then he kind of forgot about it

2008: Obama shifts stance on environmental issues - USATODAY.com

WASHINGTON — In May 1998, at the urging of the state's coal industry, the Illinois Legislature passed a bill condemning the Kyoto global warming treaty and forbidding state efforts to regulate greenhouse gases.

Barack Obama voted "aye."

The presumptive Democratic presidential nominee now calls climate change "one of the greatest moral challenges of our generation," and proposes cutting carbon emissions 80% by 2050. But as a state senator, from 1997 to 2004, he usually supported bills sought by coal interests, according to legislative records and interviews.