Is There a Guarantee That Humanity Will Survive?

Shelley: I want to agree with every word of what you say here. But i have a few quibblesd it's interesting to go into this conversation hoping to be relieved of my doubts about your thesis, i'm kind of hoping that you will perform an exorcism on my doubts, such as they are. Shel says he thinks the truth really is very positive but there is one sort of fly in the ointment, and that is that, because the future is unpredictable, nothing is guaranteed. The there is no guarantee that civilization will survive, or that our species will survive. But there is, i think, a guarantee that we can. And also, we know