The Environmental Protection Agency hasn't outlined any specific emissions limits for aircraft engines, but it has begun the process that would lead to them.
The new target was submitted to the U.N. Framework Convention on Climate Change Tuesday. It is part of a plan for a new international treaty to be hammered out in December in Paris.
He directed the federal government to cut emissions by 40 percent within the next decade and to increase its use of renewable energy sources to 30 percent of total consumption.
Faulty gear and attempts to clear liquid from wells can release enough gas to power hundreds of homes, new research reveals. Scientists say finding the leaks is a first step to plugging them.
Unlike the 1997 Kyoto treaty, the plan on the negotiating table in Lima this week asks every country, developed and developing, to limit carbon emissions. Each nation would set its own target.