is the kicker that makes it all so critical...per the attached link from MIT, it takes a VERY LONG time for the Fossil Fuel generated CO2 to leave the atmosphere...meaning that Global Warming...and all of its effects on current human habitation...will continue for quite some time...our task is the keep the level as low as possible.
It's hard to find a physicist who disagrees with the greenhouse process, the only real debate is on timing and severity...given the 'finiteness' of Fossil Fuels along with the global warming, it seems prudent to take action to get off FFs...ASAP....which admittedly is difficult for many reasons, but hardly an excuse to do nothing...or even deny its existence.
Link: https://climate.mit.edu/ask-mit/how-do-we-know-how-long-carbon-dioxide-remains-atmosphere#:~:text=“The%20first%2010%25%20goes%20quickly,thousands%20of%20years%20to%20leave.HY