世界气象组织：2017年世界气象组织温室气体公报（英文版）

The rate of increase of atmospheric carbon dioxide (CO2) over the past 70 years is nearly 100 times larger than that at the end of the last ice age. As far as direct and proxy observations can tell, such abrupt changes in the atmospheric levels of CO2 have never before been seen. The figure on the left shows the CO2 atmospheric content at the end of the last ice age, and the figure on the right shows recent atmospheric CO2 content [1]. The thin grey area on the left figure, which looks like a