350 is the most important number in the world. The NASA scientists told us three years ago that any value for carbon in the atmosphere greater than 350 parts per million was not compatible with the planet on which civilization developed and to which life on earth is adapted. That is strong language. It’s stronger still when you know that everywhere, outside your studios, up on top of Mount Everest, in the Antarctic, right now we’re at about 390 parts per million CO2 and gaining fast. That’s why this is not some future problem. It is the most pressing present crisis that we have. ~ Environmentalist Bill McKibben on Democracy Now!