Do The Math
Do the Math is a video that goes over the science behind climate change, and outlines Bill McKibben's three important numbers of climate change :
1) 2 degrees - The number that scientists and world leaders have said it would be safe to let the planet warm
2) 565 - The number of gigatons of carbon that the world could add to the atmosphere and have a reasonable chance of staying beneath the 2 degree threshold.
3) 2,795 - The number of gigatons of carbon that fossil fuel industry has in their reserves already (fossil fuel that this industry currently has accessible.)
Finally, the video ends with an examination of the Keystone XL pipeline protests as an example of humans standing up to the fossil fuel industry, raising awareness, and halting or slowing the release of greenhouse gasses.