This is interesting:
Current CO2 levels of 410 parts per million (ppm) were last seen on Earth three million years ago, according to the most detailed reconstruction of the Earth’s climate by researchers at the Potsdam Institute for Climate Impact Research (PIK) and published in Science Advances.
According to the study, scientists also discovered that during this period of Global Warming “there were no ice sheets covering either Greenland or West Antarctica, and much of the East Antarctic ice sheet was gone.”
No, actually, what this study proves is that there is nothing we can do to stop the Earth’s naturally occurring climate cycles. Even the worst of the worst, even the most maniacal pushing the Global Warming Hoax admit that, at best, we can only cool the planet a couple of degrees, which will do next to nothing if the planet is determined to again warm itself by seven degrees, as we now know it did 2,999,998 years ago.