Great time saver.

4.6 billion years in 25 minutes.

Also great review of the main points of climate change 101 – in case you are going to a barbecue with Uncle Dittohead this weekend.

Description:

NAS member Richard Alley presents on 4.6 Billion Years of Earth’s Climate History: The Role of CO2, during the Symposium—Earths, Moons, Mars & Stars at the National Academy of Sciences 152nd Annual Meeting.