Carbon Dioxide Levels Just Hit Their Highest Point In 800,000 Years

Carbon Dioxide Levels Just Hit Their Highest Point In 800,000 Years:

The concentration of carbon dioxide, the greenhouse gas that drives climate change, hit 402 parts per million this week - the highest level recorded in at least 800,000 years.

http://thinkprogress.org/climate/2014/04/09/3424704/carbon-dioxide-highest-level/