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If the United States government were interested in cutting pollution it would be investing in the development of high power clean energy sources like fusion power, antimatter research, the Casmir effect (Zero point energy), etc...
Antimatter is pretty much dead out of the gate; we cannot contain its power, perhaps ironically, because of it's power.
We did look into fusion/fission power, the public got scared by the dangers of failures and isn't ready to try again - I do think that will change if we can show fusion/fission safe in space exploration, it's just going to take a while.
Casimir/Van der Waals/quantum vacuum idea is interesting, though perhaps far better suited to space as we off the bat lose some power generation in maintaining a vacuum on earth. Over-all (as best I've seen estimated and who knows how accurately) Casimir power equates to roughly 50% of that provided by our current power generators (as I understand it, due to the power loss in vacuum maintenance as well as motion and/or heat to electricity conversion, and if I recall debates right some-what environmental interaction troubles; something about loss of motion, parallel energy draw requirements, and natural attraction I think - though I admittedly might have that confused with something else.) ~ Mostly though, as I understood it, all the theoretically/potentially possible concept models for earth bound energy generator patents were bought and held by a single company who as of yet has not revealed much of anything regarding earth bound power. I believe said company was/is working/researching only space travel engines (I think they got a research grant/contract for that research from the ISS, I've not heard of any such grant/contract regarding earth power generation and I suspect the company doesn't have the cash to pursue the idea without such grants/contracts - perhaps if/after they get paid for a space engine?)
In any event, the "green agenda" has been mostly focused on attempts to make "natural" power (solar, wind, pure hydro) more "effective," rather than on developing "new" ways to make power. Such innovations are not very likely to come from any green focused government policy; regardless of if one wants to say its because big oil owns the govs, or because the govs don't want to rock the boat, or because people won't get behind spending the kind of cash for research on the mere hopes of "possible" returns. The "government" is only as "interested" as it's people in the end...
