The Environmental Protection Agency may have suppressed an internal report that was skeptical of claims about global warming, including whether carbon dioxide must be strictly regulated by the federal government, according to a series of newly disclosed e-mail messages.

Less than two weeks before the agency formally submitted its pro-regulation recommendation to the White House, an EPA center director quashed a 98-page report that warned against making hasty “decisions based on a scientific hypothesis that does not appear to explain most of the available data.”

The EPA official, Al McGartland, said in an e-mail message (PDF) to a staff researcher on March 17: “The administrator and the administration has decided to move forward…and your comments do not help the legal or policy case for this decision.”

The e-mail correspondence raises questions about political interference in what was supposed to be an independent review process inside a federal agency—and echoes criticisms of the EPA under the Bush administration, which was accused of suppressing a pro-climate change document.

The suppressed reports notes that global temperatures have declined for eleven years, during which time atmospheric CO2 levels have increased and CO2 emissions accelerated.

The EPA’s proposed addition of “greenhouse gases” under the Clean Air Act would amount to the imposition of major new taxes on domestic agriculture and on American consumers.

The American Farm Bureau offers some figures and notes that taxing US beef and pork production will only move that production outside US borders.

Most livestock and dairy farmers would not be able to pass along the costs incurred under this plan,” said Mark Maslyn, AFBF executive director of public policy. “Steep fees associated with this action would force many producers out of business. The net result would likely be higher consumer costs for milk, beef and pork,” said Maslyn, in comments submitted to EPA.

According to Agriculture Department figures, any farm or ranch with more than 25 dairy cows, 50 beef cattle or 200 hogs emits more than 100 tons of carbon equivalent per year, and thus would need to obtain a permit under the proposed rules. More than 90 percent of U.S. dairy, beef and pork production would be affected by the proposal, Maslyn noted.

Permit fees vary from state to state but EPA sets a “presumptive minimum rate” for fees. For 2008-2009, the rate is $43.75 per ton of emitted greenhouse gases. According to Maslyn, the proposed fee would mean annual assessments of $175 for each dairy cow, $87.50 for each head of beef cattle and $20 for each hog.

In addition, Maslyn said the proposed rules would be ineffective because of the global nature of greenhouse gases. “Reduction of a ton of greenhouse gases anywhere will make a difference, but if a ton is removed in Iowa and replaced by a ton in China, then no net effect occurred,” he said. “A livestock tax and regulation of greenhouse gases under the Clean Air Act will impose restrictions and added costs on the U.S. economy without reducing greenhouse gases in the atmosphere.