whatever it is called, it is real, it is happening right now, and it is going to get really dire really quick
effects are being seen already: sea turtles are going to be extinct soon, the oceans are going to die off due to acidification and temperature variations, fisheries are being fished to nothing, massive extreme weather shifts due to changing ocean temperatures, the oceans are mostly plastic now, deserts are growing at an exponential rate, crustaceans cant form proper hard shells, etc. etc. Nature doesn't like changes, and when it does, things die on a massive scale.
I am a tree hugger, but even I know that reducing your automotive footprint is not really going to do anything on its own. Yes, it is nice if you can make some changes, but honestly, civilian transportation in cars is a tiny piece of a big puzzle.
don't worry, nature has a way of balancing things out...in a few decades, when the polar ice caps melt, bacteria that has been dormant in ice and permafrost for hundreds of thousands of years will be re-released into our environment, and humans will be unable to manage it...it will cause a mass extinction like event for mankind (or personkind if you prefer) and wipe out 3/4 of human population, bringing our numbers more in-line with how the planet can manage our existence.