The video below from Bloomberg Business gives a history of global warming in three minutes, and it marks 120 years since we have known that the earth is warming.

I’ve tended to think of global warming and the climate change debate as relatively new, but as the video shows it has been going on for longer than I thought.

http://www.bloomberg.com/news/videos/2015-07-21/a-brief-history-of-global-warming