"Humans can intelligently adapt to radically new problems in the urban jungle or outer space for which evolution could not have prepared them."
This here trips my 'then what did?' sensors. I understand the intent, but evolution -did- prepare us, by giving us general intelligence. Perhaps you meant that evolution did not -specifically- adapt us to those challenges?
I wrote a new Singularity FAQ for the Singularity Institute's website. Here it is. I'm sure it will evolve over time. Many thanks to those who helped me revise early drafts, especially Carl and Anna!