Circa the American Civil War our atmosphere contained about 250ppb (parts per billion) molecules of carbon dioxide. Carbon Dioxide is the main contributor of greenhouse gases. 350ppb is considered the safe level by climate scientists. Now, we are hearing that our count is 390ppb.
Should we do something about this, or just argue how many carbon dioxide molecules can dance on the head of our future?
Q&A: Bill McKibben on CO2 and the Future - Green Inc. Blog - NYTimes.com Bill McKibben, an environmentalist and long-time advocate for action on climate change, believes we can still reverse the growing concentration of carbon dioxide in the atmosphere, which the National Oceanic and Atmospheric Administration now estimates at 390 parts per million. (March 26, 2010) The New York Times - Breaking News, World News & Multimedia