Alan, I think your diagnosis is essentially correct. And yes, we will IMHO probably need some nuclear power for awhile (already use it of course, my own power comes from a nearby plant.) Unfortunately, it is unrealistic in practice to expect humanity to reduce population to 1-2 billion, so we are pragmatically faced with managing a situation closer to the current population, for awhile at least. My own essay deals with possible improvements to the human mind, in advance of particular objective policy ideas. Perhaps one application of the willpower training I advocate will be smaller families, as well as less consumption.
PS: No big deal, but as a cute observation, my spell checker flagged IIMO to be "IMHO" - they got that web slang in there, LOL (which did NOT make it ...)