Did trees kill the world?

Way back when forests first evolved on Earth … they might have triggered one of the biggest mass extinctions in the history of the planet. What can we learn from this ancient climate apocalypse?
For show transcripts, go to vox.com/unxtranscripts
For more, go to vox.com/unexplainable
And please email us! unexplainable@vox.com
We read every email.
Support Unexplainable by becoming a Vox Member today: vox.com/members
Please take a second to help us learn more about you! vox.com/podcastsurvey
Learn more about your ad choices. Visit podcastchoices.com/adchoices