A World Without Clouds
https://www.quantamagazine.org/cloud-loss-could-add-8-degrees-to-global-warming-20190225/
Paleocene–Eocene Thermal Maximum - Wikipedia
https://en.wikipedia.org/wiki/Paleocene%E2%80%93Eocene_Thermal_Maximum
The Last Time the Globe Warmed - YouTube
https://www.youtube.com/watch?v=ldLBoErAhz4