WASHINGTON (AP) -- Scientists say the world's air has reached a troubling new milestone for carbon dioxide, the main global warming pollutant.
Monitoring stations across the Arctic are measuring more than 400 parts per million of the heat-trapping gas in the atmosphere. The number isn't quite a surprise because it's been rising at an accelerating pace.
Years ago, it passed the 350 ppm mark that many scientists say is the highest safe level for carbon dioxide. It now stands globally at 395.
So far, only the Arctic has reached that 400 level, but the rest of the world will follow soon. Government researchers call this milestone depressing and troubling.
Scientists say carbon dioxide levels haven't been this high for at least 800,000 years.
KKTV firmly believes in freedom of speech for all and we are happy to provide this forum for the community to share opinions and facts. We ask that commenters keep it clean, keep it truthful, stay on topic and be responsible. Comments left here do not necessarily represent the viewpoint of KKTV 11 News.
If you believe that any of the comments on our site are inappropriate or offensive, please tell us by clicking “Report Abuse” and answering the questions that follow. We will review any reported comments promptly.powered by Disqus
Updated: 05/20/2013 - Two weekends left to catch one great show!