WASHINGTON — The world's air has reached what scientists call a troubling new milestone for carbon dioxide, the main global warming pollutant.
Smoke billows from a chimney of a heating plant as the sun sets in Beijing in this Feb. 13, 2012 photo.
Monitoring stations across the Arctic this spring 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. Read more
Source : www.onlinesentinel.com
