The Supreme Court heard arguments in a major environmental case over a rule that requires states to stop their air pollution from drifting over to neighboring states. Three states, led by Ohio, are claiming the rule is too costly and they’re asking the court to block the so-called “good neighbor” policy. William Brangham discussed the case with Coral Davenport of The New York Times. Stream your PBS favorites with the PBS app: https://to.pbs.org/2Jb8twG Find more from PBS NewsHour at https://www.pbs.org/newshour Subscribe to our YouTube channel: https://bit.ly/2HfsCD6 Follow us: TikTok: https://www.tiktok.com/@pbsnews Twitter: http://www.twitter.com/newshour Instagram: http://www.instagram.com/newshour Facebook: http://www.pbs.org/newshour Subscribe: PBS NewsHour podcasts: https://www.pbs.org/newshour/podcasts Newsletters: https://www.pbs.org/newshour/subscribe