Dot Earth – Climate Change & Sustainability – The melting Arctic icecap, as seen from a NASA satellite in September 2007. (AFP/Getty Images)Our planet is a lonely speck in the great enveloping cosmic dark. In our obscurity — in all this vastness — there is no hint that help will come from elsewhere to save us from ourselves. It is up to us. — Carl Sagan, “Pale Blue Dot” speech, 1996
