The U.S. Supreme Court has confirmed that the Environmental Protection Agency has the authority to limit climate pollution.

Over the last few weeks, the nation’s federal courts—including the Supreme Court—have blessed Americans with four major clean air victories.

The highest court of the land will hear argument in a case that is important to anyone with lungs. A vital air safeguard, the 2011 rule would require power plants in more than two dozen states to clean up nitrogen oxide and sulfur dioxide pollution that drifts across state borders and contributes to harmful soot (particles) and smog (ozone) pollution in downwind states.