Well, whaddya know. 60 Minutes just aired a powerful segment, excerpted here, about the Bush administration's censorship of global-warming science. The witness was none other that a NASA scientist whose credentials were impeccable, and showed the actual interlineations and deletions of his reports, handwritten by "a lawyer, a politician" in the White House, who had been an oil industry lobbyist before joining the White House staff.
At the end of the segment, the reporter said the White House had refused to comment on the segment, and the "lawyer-politician" was no longer in the White House, having left the administration a year before to be hired by Exxon-Mobil. Good stuff.