Ian Morris on "why the west rules", which seems to be a provocative title for an interesting book on historical geographical trends and their projection into the future: http://www.youtube.com/watch?v=tvkHiL-H2io. He starts talking about the future at minute 27 and basically concludes that a singularity scenario is one of two possibilities for the 21st century, the other being collapse. Nothing new, but encouraging to see this increasingly in the mainstream.
Yes. Much less for 200 years, where I expect ems to speed up progress, if nothing else happens before.
I will be a little surprised if ems take over fifty years (given business as usual), but I guess ninety is not beyond the bounds of possibility.