|Atmospheric concentrations of carbon dioxide last year rose by the biggest margin since records began, according to a US federal science agency.|
Carbon dioxide levels are increasing faster than they have in hundreds of thousands of years. CO2 levels have increased over 40% since 1880.
|The last time the Earth experienced such a sustained CO2 rise was between 11,000 and 17,000 years ago, in which period CO2 jumped by 80ppm. Today’s rate is 200 times faster than that. Scientists have plotted global CO2 levels since 1958 in what is known as the Keeling Curve.|
It was the fourth year in a row that carbon dioxide concentrations grew by more than 2 parts per million, with an annual growth rate of 3.05 parts per million in 2015. The spike comes in the same year that Earth reached an ominous global warming milestone -- scientists last year measured the highest atmospheric concentrations of carbon dioxide ever recorded.