chris horner was formerly a registered lobbyist for oil, gas and chemical companies.limatologist pat michaels of the cato institute has estimated 40% of his funding has come from fossil fuel interests. >> ...of politics getting into science. >> hockenberry: exxon at one time was one of heartland's most generous donors. >> there were a lot of corporations, including oil companies, that objected to the kyoto accords in 1997. but most of them lobbied against the treaty on economic and fairness grounds. but exxon did something that i think was fairly radical, which was that they chose to go after the science. >> and as for carbon dioxide, it isn't smog or smoke; it's what we breathe out and plants breathe in. >> hockenberry: borrowing tactics used on behalf of the tobacco industry, advocacy groups were enlisted to confuse the issue and shut down new federal regulations. >> they call it pollution, we call it life. >> a lot of these groups were run by economists, litigators, lawyers and public policy specialists-- people who specialized in getting a message out. >> hockenbe

chris horner is an attorney and senior fellow at the institute and currently suing the epa to release more documents about jackson's case, the man who began, really, the inquiry that led to all of this. chris, i think it's fair to say, and so now we learn and we should say the he epa says that lisa jackson did not resign because of the inquiry into the the use of the alias and e-mailing people under richard windsor, her dog and her home street, they claim and now we learn she wasn't the only one, james martin liked to use his personal account to conduct official business, too, and this resignation has nothing do with the inquiries made by the house of representatives into why they were doing this. your thoughts. >> well, they can say that, but what else do you expect them to say. it's just not plausible when you look at the timeline and the fact that this was really their only way to avoid questioning and at least in one of the cases, we're pretty sure under oath, about their, what we'll call record to management practices. we've got one creating a false identity for certain correspon