A Glimpse Into Our Carbon-filled Future. It's 2009 and the concentration of carbon dioxide in our atmosphere is 387 parts per million.
According to NASA climate scientist James Hansen, we need to cut our carbon emissions to get that number down to 350 ppm to avoid the truly ghastly effects of global warming. Here's what could be in store for us if we carry on our business as usual. TerraPass: fight global warming, r. Flood Maps.