Posts Tagged ‘ 350ppm ’

Greenhouse gas levels pass symbolic 400ppm CO2 milestone

Jun 2nd, 2012 | By

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. The number isn’t quite a surprise, because it’s been rising at an accelerating

[continue reading…]