tony soprano had a seat in the senate. if this congress can't even clean up the most egregious polluter in its own backyard, how can they deal with the problem across the entire united states? >> smith but in 2008, there was a new push on capitol hill to rein in carbon emissions. >> sir, i started by members... >> ...that were highly controversial in the energy committee. >> smith: senator john warner had drafted legislation, along with senator joe lieberman, to mandate a 60% cut in greenhouse gases by mid-century. >> well, we have a prodigious task. >> smith: and while how the industry does that is unclear, the bill's authors are betting on it. is there a future for coal? >> there's got to be a future for coal in the us. it's too important to us. and again, i think once you create this law, this mandate, the coal industry and a lot of others are going to figure out how to use coal and not pollute the air. >> in the marshlands of central florida, there's not much activity for people. >> smith: to make the case for clean coal, the industry likes to point to a power plant outside tampa, florida, known as polk one. ge made a short film about it. >> with the help of ge's advanced cleane