The Environmental Protection Agency said Thursday it would set standards for greenhouse gas emissions from the country's two biggest sources: coal-fired power plants and refineries.
Gina McCarthy, the assistant administrator for the EPA's Office of Air and Radiation, said it would be possible to hold down costs, add jobs and reduce overall emissions even as the plants continue to burn fossil fuels. She said it wasn't possible to estimate yet how much emissions would be reduced.
Scientists globally are in strong agreement that that heat-trapping gases are accumulating in the atmosphere mainly as a result of fossil-fuel use and that sharp cuts in emissions will be needed in the next few decades.
The EPA's new regulations are likely to have only a modest impact on emissions despite worldwide consensus that dramatic cuts are needed to lower the risks of dangerous climate shifts. A plan to impose mandatory reductions on emissions died in Congress last summer.