The Environmental Protection Agency (EPA) is expected to propose regulations that would limit greenhouse gas emissions from power plants, which make up 25% of such emissions in the U.S. If successful, the new rules would see almost all coal and gas plants cut or capture most of their carbon dioxide emissions by 2040, while future plants would also be subject to the new standards. David Doniger, senior strategic director for the Natural Resources Defense Council's Climate & Clean Energy program, said that regulations of this nature, along with new emissions standards for vehicles, are among the most important the administration can implement to tackle climate change. However, if implemented, the regulations will face opposition from the fossil fuel industry and power plant groups, which are likely to seek a legal challenge.