May 31, 2012
From The Associated Press:
The world's air has reached what scientists call a troubling new milestone for carbon dioxide, the main global warming pollutant. Monitoring stations across the Arctic this spring are measuring more than 400 parts per million of the heat-trapping gas in the atmosphere.
Learn more here
Did this article have an impact on you? Tell us how! Whether you’re moved to take action, have a question, or want to share a comment (good or bad), we value your feedback!