It’s not a joke. What are you talking about? 56 million years ago (Paleocene-Eocene Thermal Maximum, the last time temperatures were six degrees higher? Or, back when earth was a molten rock of lava? That’s completely irrelevant to this discussion. Temperatures haven’t been higher than a degree since the last ice age (see the excellent relevant xkcd: https://www.climatecentral.org/news/climate-change-xkcd-comi...). Rapid anthropogenic global warming does not bode well for human civilization. That doesn’t mean life on earth or humans as a species will be wiped out, but you can’t say “earth was hotter when the dinosaurs were around, so, no problem”