Your annual reminder:
As of this month, May 2021, the world has reached 419ppm of atmospheric carbon dioxide — by far the highest levels in the 10,000 years since humans invented agriculture & in the 3+ million years modern humans have existed.
We are in a climate emergency. pic.twitter.com/jhhvhn8Swl
— Eric Holthaus (@EricHolthaus) May 21, 2021