What is causing the Climate to Change?

Excerpt from the AGU 2017 Fall Meeting summary presentation of the Climate Science Special Report, the Fourth National Climate Assessment. Speaker Don Wuebbles Full summary presentation 2017 Fall Meeting – U23A: Climate Science Special Report https://www.youtube.com/watch?v=fDJP5RgKkj4 Teaser photo by Tim Marshall https://unsplash.com/photos/yEOCA6oiVqg Teaser photo by Christopher Campbell https://unsplash.com/photos/i4OHxtxiMtk Teaser photo https://unsplash.com/photos/aEJVd7WUjf8