If you get caught with a plastic bag in Nairobi these days, you're on the hook for $1,000. That's because Kenya has signed up to a "circular economy" that bans single-use plastics, so there's no choice but to recycle. UN Environment Programme Executive Director Inger Andersen says more nations are finally responding to growing public awareness about plastic pollution, which she thinks could drive policy change like the hole in the ozone layer did decades ago.

Watch this episode of GZERO World with Ian Bremmer: Surviving a warming planet