1. Mass transit and rapid transit.
2. Pedestrian friendly transit village living.
3. Hybrid cars - using sophisticated "drive by wire" engine management (see the annual "Automotive Issue" of the IEEE Spectrum).
a. Push CAFE up to 35-40 mpg
b. Flexible fuel
c. Plug In hybrids
d. Clean diesel hybrids
4. Photovoltaic - Google "Ovonics" and "Ovshinsky"
5. Wind power.
6. Fischer-Tropsch synthetic gasoline.
While these are desirable technologies, I have not seen evidence to convince me they can be implemented in such a way as to allow something as monstrous as a 50% reduction in petroleum use. Also, those technologies only indirectly address consumption sources such as home heating and jet fuel. However I realize you did not make the original claim.
I also believe you have soft-pedaled the discussion of the costs of technologies. The fundamental reason why all of those technologies have not been adopted is not politics and conspiracy, it is the simple fact that it is simpler and cheaper to extract massive amounts of energy from fossil fuels. This was true throughout the 20th century and is still true today. The implied costs of your list of technologies includes reduced suburban living choices (from mass transit and pedestrian friendly housing), more expensive vehicle designs (hybrids), less abundant electricity (I will be shocked if PV and wind combined ever outproduce coal and NG at high quantity), and less abundant fuel (how much biodiesel can really be produced?).
I believe technology should be applied to our energy situation, but I believe it is deceptive to pretend these technologies are cost-free and enable a continuation of the status quo. While Oil/NG supply disruption will be devastating to the American economy, I believe a strong push toward 'defossilizing' with technology will be as well.
Have you actually read Lovins' books, been to RMI, met Lovins and heard him speak -- or is the response some kind of a Malthusian response from Kunstler.
BTW- I have only been in the alternative, renewable, and green energy field - as a working engineer and as an adjunct professor and as a regulator - for 30+ of my 40+ years in the engineering profession.
My familiarity with Lovins is limited to what is published on his website. I have no reason to believe he is not a great thinker, however my opinion is that the fundamental approach of RMI insufficiently addresses the idea that growth (in all forms) must have limits. More energy conserving devices typically require a much more advanced industrial base to support them, something I don't see the 'green' community discussing very often. Which leads to a question I have about RMI (since you are familiar with them). What is their vision for how heavy industry will operate in a 'fossil-less' economy? I'm talking about things like steel mills, foundries, semiconductor fabs, etc. My guess is the answer is "hydrogen generated from windmills" - which isn't very reassuring.
To answer your other question, I am a Malthusian (everyone's favorite pejorative for one who doesn't believe in endless growth) and Kunstler is definitely somebody with a similar viewpoint to myself. Hopefully I can now be properly filed in your mental rolodex.
My profession has nothing at all to do with energy issues. I am simply somebody wishing to be more informed. I do appreciate the ability to talk to someone with your background and experience. However my only qualm about your "resume" is that it suggests you may be heavily invested in the emotion of alternative energies and less willing to address their deficiencies.