> It seems hard to imagine that humanity could be completely wiped out. Billions dying in a huge catastrophe? Maybe. Terrible survival conditions for the surviv

> It seems hard to imagine that humanity could be completely wiped out. Billions dying in a huge catastrophe? Maybe. Terrible survival conditions for the survivors? Possibly. Complete annihilation? Improbable. "Maybe" and "Possibly" are pretty vague. You seem to imply the odds are quite low. You list the last case as "Improbable". Do you really have any solid ground for making these judgements? You say it seems hard to imagine. One thing that history clearly shows is that the future is always hard to imagine, and that you always have to expect the unexpected.