Global CO2 Levels Approach Worrisome Milestone
Wednesday, May 1, 2013 - 18:00
in Earth & Climate
Near the moonscape summit of the Mauna Loa volcano in Hawaii, an infrared analyzer will soon make history. Sometime in the next month, it is expected to record a daily concentration of carbon dioxide in the atmosphere of more than 400 parts per million (p.p.m.), a value not reached at this key surveillance point for a few million years. [More]