The extinction crisis
Clip: Season 4 Episode 37 | 6m 11s Video has closed captioning.
A new study is re-evaluating the extinction of thousands of animal and plant species. Leading this project is Columbia University professor and biologist Don Melnik. He joins Hari Sreenivasan to explain why he believes current extinction estimates are vastly underestimated.
Problems Playing Video? | Closed Captioning