WASHINGTON (AP) -- The Environmental Protection Agency took a major step Monday toward regulating greenhouses gases, concluding that climate changing pollution threatens Americans' health and the environment.
The announcement came as the Obama administration looked to boost its arguments at an international climate conference that the United States is aggressively taking actions to combat global warming, even though Congress has yet to act on climate legislation. The conference opened Monday in Copenhagen.
The EPA said that the scientific evidence surrounding climate change clearly shows that greenhouse gases "threaten the public health and welfare of the American people" and that the pollutants -- mainly carbon dioxide from burning fossil fuels -- should be regulated under the Clean Air Act.
"These long-overdue findings cement 2009's place in history as the year when the United States government began addressing the challenge of greenhouse-gas pollution," said EPA Administrator Lisa Jackson at news conference.
The action by the EPA, which has been anticipated for months, clearly was timed to add to the momentum toward some sort of agreement on climate change at the Copenhagen conference and try to push Congress to approve climate legislation.
"This is a clear message to Copenhagen of the Obama administration's commitments to address global climate change," said Sen. John Kerry, a Democrat and lead author of a climate bill before the Senate. "The message to Congress is crystal clear: get moving."
Under a Supreme Court ruling, the so-called endangerment finding is needed before the EPA can regulate carbon dioxide and five other greenhouse gases released from automobiles, power plants, and factories under the federal Clean Air Act.
The EPA signaled last April that it was inclined to view heat-trapping pollution as a threat to public health and welfare and began to take public comments under a formal rulemaking. The action marked a reversal from the Bush administration, which had refused before leaving office to issue the finding, despite a conclusion by EPA scientists that it was warranted.
Business groups have strongly argued against tackling global warming through the Clean Air Act, saying it is less flexible and more costly than the cap-and-trade bill being considered before Congress. On Monday, some of those groups questioned the timing of the EPA's announcement, calling it political.
"The implications of today's action by EPA are far-reaching...individual Americans and consumers and businesses alike will be dramatically affected by this decision," said Charles T. Drevna, the president of the National Petrochemical & Refiners Association. Drevna, in a statement, said "it is hardly the time to risk the remainder of the U.S. industrial sector in an attempt to achieve a short-term international public relations victory."
Any regulations are also likely to spawn lawsuits and lengthy legal fights.
The EPA and the White House have said regulations on greenhouse gases will not be imminent even after an endangerment finding, saying that the administration would prefer that Congress act to limit such pollution through an economy-wide cap on carbon dioxide and other greenhouse gases.
Nevertheless, the EPA has begun the early stages of developing permit requirements on carbon dioxide pollution from large emitters such as power plants. The administration also has said it will set the first-ever greenhouse gas emissions standards for automobiles and raise fuel economy to 35 miles per gallon by 2016 to reduce carbon dioxide emissions.
The EPA's readiness to tackle climate change is expected to give a boost to U.S. arguments at the climate conference opening in Copenhagen this week, where the United States offer a provisional target to reduce greenhouse gases.
While the House has approved climate legislation that would cut emissions by 17 percent by 2020 and about 80 percent by mid-century, the Senate has yet to take up the measure amid strong Republican opposition and reluctance by some centrist Democrats.