Oddly enough, all of Earth's hottest inter-glacial periods, such as the Hadean, the late Neoproterozoic and the PETM (Paleocene-Eocene Thermal Maximum) all occurred long ago before man and long before industry or any ability to blame climate change on man's industrial activity. Life came, it grew, it evolved and changed as the climate evolved and changed. Of course, man could not survive losing modern industrial activity without going back to an agrarian culture of the 18th century and giving up 2/3rds of its population. But the climate-fear-mongers never want to come to grips with that. Modern human civilization has developed over just the past 10,000 years or so. The period has generally been one of low temperatures and relative global climate stability. As always, the Earth moves on, indifferent to our needs but rather than adapt to meet the Earth, the modern liberal dreams of controlling/changing the Earth to meet HIM.
Maybe the problem isn't the climate but US. If Earth has a problem, maybe it is that it has 7.4 BILLION people on it now, and it is merely making a course correction to re-balance us as it does everything, back to maybe a more reasonable 3 billion. That should be about right. If that happens, it might be survival of the fittest, and my observation has always been that liberals and leftists are usually the WEAKEST.