all life on this planet will end. that’s a fact. at one point temperatures will rise into the 400s as all the oceans boil away and our atmosphere becomes a vapor filled haze, like Venus. no extremophilic bacteria will be able to survive it, they max out around 100 degrees celsius. at the latest, this will happen when the sun expands and gets closer to us, hundreds of millions of years.

however, since heating is a positive feedback process past a certain point, this really can be kickstarted by humans early. once we enter the increased evaporation cycle with enough ‘climate acceleration’, the heat retaining properties of the water vapor will be enough to cause greater evaporation. ta-da, runaway feedback, 450 degrees, all life is done.

and to cover a last pedant point, yes it is theoretically possible that a life form will exist that can float 45 kilometers off the planet and using light and sulphur imbalances to survive. however, i’m confident in saying that that life would not be able to evolve quickly enough to account how fast (geological time-wise) the heating of earth would occur.