Lurking in the near-background behind every environmental story is one shared truth: We are running a grand experiment on planet Earth and there are simply too many people on it. The solution? That's where it gets tricky. Join the Green Radio Hour with Jon Bowermaster for a conversation with two who have studied the issue for decades, Terry Spahr and Don Weeden. And check out Terry's new documentary, '8 Billion Angels,' coming soon to a streaming channel near you. And then we catch up with Ruthy Unger and Mike Merenda, about their new -- virally-released -- song and album, 'Born to Win,' lyrics by Woody Guthrie.