And now, the bad news, from elsewhere on that same website
CO2 concentration nears 400ppm
The last time the greenhouse gases were at 400 ppm was likely the Pliocene epoch, between 3.2 million and 5 million years ago.
The current reading is at 399.72 ppm -- far past the 350 ppm level many, including noted climate scientist James Hansen, have warned is the upper safe limit before the planet hits a tipping point.
