It's one of the most important Supreme Court cases you may never have heard of: Massachusetts v. Environmental Protection Agency. The ruling held that the U.S. government could regulate greenhouse gases. Today we’re sharing the wild backstory of this critical Supreme Court case, from a podcast we love,“Outside/In,” from New Hampshire Public Radio. If you don’t believe a legal case in all its intimate details can be riveting, take a listen. And be sure to check out all the other great episodes from Outside/In. We'll be back next week with a new episode of How to Save a Planet. In the meantime, check out our Calls to Action archive here for all of the actions we've recommended on the show. Send us your ideas or feedback with our Listener Mail Form. Sign up for our newsletter here. And follow us on Twitter and Instagram. How to Save a Planet is reported and produced by Kendra Pierre-Louis, Rachel Waldholz and Anna Ladd. Our intern is Ayo Oti. Our senior producer is Lauren Silverman. Our editor is Caitlin Kenney. Sound design and mixing by Peter Leonard with original music from Emma Munger.