ThinkProgress: On Monday, scientists at the National Oceanic and Atmospheric Administration`s Mauna Loa observatory in Hawaii told Climate Central that June would be be the third month in a row where, for the entire month, average levels of carbon dioxide were above 400 parts per million (ppm). In other words, that`s the longest time in recorded history that this much carbon dioxide has been in the atmosphere.
The finding is troubling to climate scientists, several of whom told ThinkProgress on Monday that the...