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Science around environmental matters has long been dismissed in the rough and tumble of U.S. politics, but many scientists contend things got markedly worse through two terms under President Bush, as incidents have shown how political appointees were involved in shaping government reports on everything from climate change to condoms.

Now, more than half the 1,600 Environmental Protection Agency scientists who responded to an online questionnaire complained of political pressure in interpreting and performing their work.

And four in 10 scientists who have worked at the agency for more than a decade said interference has been more prevalent in the last five years than previously.

Here's the full report, Interference at the EPA, by the Union of Concerned Scientists.