Why large numbers of reptile species face extinction and what that means for our ecosystem

Summary: Globally, about 20 percent of reptile species are facing the threat of extinction. That's according to a recent study in the scientific journal "Nature." Geoff Bennett takes a deeper look now at what's driving this extinction crisis and what it could mean for the rest of the world. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders