An observatory high on Hawaii's Mauna Loa volcano that measures carbon dioxide in the atmosphere has reported its highest ever seasonal peak concentration of the greenhouse gas. For the first time, ...

Earth inhales and exhales carbon, indicating where and when vegetation is growing (sucking up carbon dioxide) or dying off (releasing carbon dioxide).

Atmospheric carbon dioxide levels reached an all-time record high last month, after growing at one of the fastest rates on record, according to a National Oceanic and Atmospheric Administration report ...