Climate change isn't a recent happening, people have seen cases all throughout the planets history. The problem is with how fast it's progressing. Tens of thousands of years only taking hundreds of years for the same results. People are becoming afraid because while climate change is natural, what's happening is an irregularity. An irregularity that's happening because of outside intervention.
The PETM might've happened a long time ago but looking at the time period shows the future humans are heading towards. The change in temperature, while only a few degrees to some, is in truth deadly. Humans can survive about 108 degree Fahrenheit temperatures, but schools close down when temperatures reach above 100 degrees.
. Just this year, California, Death Valley reached 130 degree Fahrenheit.
A few degrees might not seem like much but when these temperatures are the consequence, it doesn’t matter if historically the planet has come out of it naturally. It doesn’t matter if it’s natural or man made changes. The real question is will everyone survive it.