S1E73 - What Happens Inside Earth's Forbidden Zones?

What grows in the spaces humans are forced to abandon?
Hannah brings Michael an actual piece of barbed wire from the Korean Demilitarised Zone, one of the most heavily fortified and forbidden borders on Earth, and it sends them somewhere unexpected.

From deserted no man's land and radioactive exclusion zones to remote islands that most of humankind has quietly agreed to leave well alone, they explore the surprising ways life adapts to the damage we leave behind.
Plus your questions: the scientific fact that scared Michael most, where tectonic plates actually go when they...