Today, we’re talking about population. How it went from being on the front pages of our newspapers and all over late night television to being the issue that you’ll only hear from out of the mouth of comic book super-villain Thanos. It's a big story, so we're spending two episodes on it.

Also, we promised you a link to David Roberts' Vox piece, so here's that.

Find more at outsideinradio.org

Learn more about your ad choices. Visit megaphone.fm/adchoices