- 21 March 2016
We are now putting carbon into the atmosphere at a rate unprecedented since at least the age of the dinosaurs, scientists say.
The researchers have examined ocean sediments laid down during the so-called Palaeocene-Eocene Thermal Maximum - a dramatic warming event some 56 million years ago.
They find the amount of CO2 going into the air at its onset was four billion tonnes a year at most.
Today's figure is 10 times as big.
[whole BBC article]