You clearly don't understand what you are talking about, based on this.
Hyperbole much? The Earth used to be a molten rock and from it life sprung forth. Do you honestly believe that we can put it into a worse position?
Humans might go extinct, but I'm certain that life will go on.
Nuclear weapons were inevitable, they are trivial inventions.
Nobody would have fought over climate policy a 100 years ago. Climate change barely received any publicity before James Hansen's testimony in 1988.