Bill Gates explains how no one knows how to stop bovine flatulence, a major contributor to climate change.
원문출처 : https://www.cnn.com/videos/tv/2019/02/16/exp-gps-0217-gates-on-cow-farts.cnn
원문출처 : https://www.cnn.com/videos/tv/2019/02/16/exp-gps-0217-gates-on-cow-farts.cnn