You're ignoring the spirit of OP's statement, and your sort of weird argument always pops up in this kind of discussion. Yes, obviously, we won't blow the absolute planet up. Maybe animals and plants will survive past us in some fashion. Maybe, even if we all die, there will come a day when a new evolutionary tract brings a human-like thing back to the world.

BUT the spirit is:

>we are the only thing on the planet capable of causing the end of the world, such as it is.

Meaning, we are the only thing on the planet capable of willingly causing our own extinction. This, for all intents and purposes, is the end of the world. World, again, in this context refers to humans and the human experiment.

I don't get the argument that "oh, you mean the death of all humans, the planet will be fine". How is that better? We still all die.