The problem isn't that we are shifting the climate into some mode that has never existed on this planet. It's that we're shifting it into a very different mode

The problem isn't that we are shifting the climate into some mode that has never existed on this planet. It's that we're shifting it into a very different mode from the one that ecosystems and society is adapted to and the changes are happening much more rapidly than under normal making it harder for ecosystems and society to adapt. Scientists have been studying this in depth for a long time now. They know what things push on the climate naturally and how much they're pushing now. They know how much raising CO2 pushes on the climate. The best estimate is that humans have caused 100% of the warming in the last 50 years. I think if you look at the long term trends before the industrial revolution it's pretty clear that we've caused more than 100% of the warming because there was a clear cooling trend before we stepped in. We have caused a 50% increase in CO2 in the atmosphere. The basic physics of that is the co2 we released is trapping 4 Hiroshima bombs per second worth of extra heat energy in the climate system. The planet is hotter than it's been in 100,000 years. CO2 the most important greenhouse gas is higher than it's been in millions of years. The oceans have absorbed half our co2 emissions and become 25% more acidic as a result. This is a massive, reckless, unplanned experiment with the thermal and chemical properties of the only planet we have. There's no backup. Nobody who isn't insane would have knowingly decided to do this this way.