Our manic and compulsive building of ever more highways to ever more suburbs further out in the agricultural and woodlands (displacing wolves and bears and deer - they are NOT invading our habitat ---> we are invading their habitat), and building ever more and larger houses (more cubic feet to heat and air condition) with the merest lip service to insulation and energy management. This is problem number one. That's where I side with Amory Lovins and his works on housing and architecture.
Kunstler really raises two "core" hydrocarbon issues with agriculture--
1. Hydrocarbon ag chemicals
2. Hydrocarbon fuels.
The hydrocarbon ag chemicals are the nitrogen fertilizers that use "by-product" hydrogen from petroleum refineries. While easier said then done - petroleum refinery by-products and reformer gas will price themselves out of the market and be replaced with other hydrogen sources. Meanwhile, the pesticides and herbicides are complex products at the end of a long chain of synthetic organic chemistry from the petroleum refinery -- and given the creativity of synthetic organic chemists, these herbicides and pesticides could just as easily come from biomass feed stocks or coal (original source in the days of coke ovens for the steel industry).
As to hydrocarbon fuels -- agriculture equipment will inevitably be modified to run on synthetic natural gas from, for example, anaerobic digestion of farm waste and sewage. See
- and I Googled and Dialog'ed and ChemAbs'ed this -- this is moving very rapidly in our "Big Ten" schools -- and in the mid-west. It is real.
I agree with Kunstler that there will be dislocations and adjustments -- but I disagree that we will go back to a labor intensive, local agriculture.
As to the suburbs and land use issues generally, I have to go along with the Berkeley CA founded (credit to Stu Cohen, a real "San Francisco-Berkeley" activist) and based - mass transit, mass transit, mass transit, pedestrian friendly, pedestrian friendly, pedestrian friendly, transit friendly, transit friendly, transit friendly, high density housing, high density housing, high density housing. Stu advocates a return to the multi-use neighborhoods that existed before the highway building and suburb building boom of the 1940's (when most kids walked to school, most people walked to neighborhood shopping, most people took mass transit to work.... ).