When you see photographs of the Earth from far away, the implications may not immediately be clear. This puts it all into perspective.
This photograph of Earth taken by Voyager 1 was dubbed "Pale Blue Dot."
For more videos featuring the calming bass of Carl Sagan's voice, check out The Sagan Series on YouTube.
Climate Summit 2014 provides a unique opportunity for leaders to champion an ambitious vision, anchored in action that will drive a meaningful global agreement in 2015. Everyone can step up and take climate action. Visit the UN Climate Summit site to find out how. #Action2015