The Do The Math movie is a 42-minute documentary film about the rising movement to change the terrifying math of the climate crisis and challenge the fossil fuel industry. The math revolves around these three numbers: to stay below 2 degrees Celsius of global warming we can emit only 565 more gigatons of carbon dioxide versus the 2,795 gigatons held in proven reserves by fossil fuel corporations. This warming rise was agreed to in the 2009 Copenhagen Summit as a limit. NASA scientist James Hansen says "2 degrees of warming is actually a prescription for long-term disaster."[35]