Obama knew it was based on questionable data and rammed it through anyways.
"CNET reports that less than two weeks before the EPA formally submitted its pro-carbon dioxide regulation recommendation to the White House, an EPA center director quashed a 98-page report that warned against making hasty 'decisions based on a scientific hypothesis that does not appear to explain most of the available data.'
http://news.cnet.com/8301-13578_3-10274412-38.html
Here is the 98 page report in pdf format
http://cei.org/cei_files/fm/active/0/DOC062509-004.pdf