It's Earth Day, and the prognosis for our planet isn't great. We've passed 400 parts per million of carbon in the atmosphere, high above the 350 ppm from which 350.org took its name - signifying the maximum levels we can sustain if life is to survive on earth. As Dr. James Hanson,  former head of the Goddard Institute for Space Studies. and one of the most respected climatologists in the world, said of our situation: “If humanity wishes to preserve a planet similar to that on which civilization developed and to which life on Earth is adapted, paleoclimate evidence and ongoing climate change suggest that [...]