Carbon dioxide is rising at its fastest rate in 66 million years

Humans are releasing planet-warming carbon dioxide at about 10 times faster than the most rapid event of anytime in at least the past 66 million years. This leaves us without a historical analogue to guide predictions for how climate change will affect the world in coming years, a new study has found

The study, published Monday in the journal Nature Geoscience, comes about a week after news broke that the level of carbon dioxide in the Earth’s atmosphere spiked by the largest amount on record in 2015, and on the heels of the hottest year and mildest first two months of 2016 on record