Climate change is the most serious issue humanity has ever faced. Scientists agree that it's happening and is caused by human activity with as much certainty as the fact that smoking causes cancer.
"It's simple math: we can emit 565 more gigatons of carbon dioxide and stay below 2 degrees Celsius of warming - anything more than that risks catastrophe for life on earth. The only problem? Burning the fossil fuel that corporations now have in their reserves would result in emitting 2,795 gigatons of carbon dioxide - five times the 'safe' amount. Fossil fuel companies are planning to burn it all - unless we rise up to stop them!" - 350.org