I gave you point because you asked the right question about the timeframe.
Consider it 12000-28000 years. Because this is timeframe between quite regular Ice Ages. And any tech-based civilization is wiped by serious icing event. Its inevitable. Thus it is not hypothetical global warming you shold be afraid of, but global cooling. And it is right about to start. Your grand-grand-grandson must get a skill of flintcnapping from you, not server administration, or stock brokerage, if ou want him live.
Consider it 12000-28000 years. Because this is timeframe between quite regular Ice Ages. And any tech-based civilization is wiped by serious icing event. Its inevitable. Thus it is not hypothetical global warming you shold be afraid of, but global cooling. And it is right about to start. Your grand-grand-grandson must get a skill of flintcnapping from you, not server administration, or stock brokerage, if ou want him live.