Well, this planet's been hit by asteroids including the massive one that made the Chixhulub crater, and life persisted. I think the idea that some life wouldn't survive all but the most catastrophic event (i.e. something liquifying the entire crust) is honestly nuts. Pumping a bunch of CO2 into the atmosphere isn't going to destroy life; there's plenty of plants and bacteria that thrive with lots of CO2, even if humans don't.