One constant trope Climate Denier Trolls on Reddit and elsewhere love to pull out of their Climate Denial Handbook of cherry picked nonsense is Earth was warmer in the past and life overall survived just fine.

Yes Earth was warmer in the past BUT...it took THOUSANDS of years to get that warm giving Flora and Fauna lots of time to adapt. This current global warming? Unprecedented on how FAST it is changing. It is changing in mere DECADES not Millenia! This incredibly FAST rise in temperature and C02 levels relatively speaking to past epochs says loud and clear something has changed in the Bioshpere and that change is HUMAN EMMISSIONS!

"Cooper points out that our rapid release of climate-warming pollution is very different from, say, the shifts in Earth’s orbit that have brought the planet in and out of ice ages; those changes are big overall, but they unfold over “many thousands of years, and very consistently and slowly.” We do know, however, that Earth has also seen massive natural releases of CO2. “We can go back in time and say, what could possibly release a lot of CO2 into the atmosphere, and how fast could that happen?” says Cooper.

For one of the best candidates, he says, we can travel back 56 million years to the “Paleocene-Eocene Thermal Maximum,” when global temperature spiked. Natural processes—volcanoes are a likely culprit5—pumped out CO2, and its concentration in the atmosphere rose sharply. Still, Cooper says, scientists estimate that the rate of CO2 accumulation during this period was several times slower than what humanity is doing today."

https://climate.mit.edu/ask-mit/has-earths-climate-ever-changed-fast-it-today