Within five years atmospheric CO2 will pass 427 parts per million, which was the probable peak of the mid-Pliocene warming period 3.3m years ago, when temperatures were 3C to 4C hotter and sea levels were 20 metres higher than today. https://t.co/84j99pLUqz

— Paul Dawson 📚 (@PaulEDawson) October 16, 2020