One in Five Tree Species is on the Brink of Extinction

There are a little over 60,000 individual species of trees in the world. More than 11,000 of these are at risk of extinction and 3,300 are critically endangered - meaning that without intervention, they will become extinct. Doris Honold discusses how U.K.-based Botanic Gardens Conservation International and their Tree Conservation Fund are working with communities to save trees from extinction.