“Death solves all problems — no man, no problem.”
“Solving a problem in a hundred years is, practically speaking, the same as not solving it at all.”
“All life is problem solving”
“The conservation of natural resources is the fundamental problem. Unless we solve that problem it will avail us little to solve all others”
“That's what this book is about: other worlds, what awaits us on them, what they tell us about ourselves, and - given the urgent problems our species now faces - whether it makes sense to go. Should we solve those problems first? Or are they a reason to go?”