I'd agree with that. Heating isn't such a big problem - I read that some newhouses in cold parts of Germany are heated purely by the body heat of the people living there and clever uses of insulation. I'm sick to death of the houses where I live in Bristol, UK, which can't have their old wooden sash windows  replaced because of planning regulations. Personally I think a building that leaks heat like a torpedoed boat doesn't deserve to be kept that way on aesthetical grounds (these are terraced homes hundreds of years old)

Despite such idiocies in planning councils, I think insulation can fix a lot heating problems. It's heat for cooking (ovens, hot plates, kettles) I worry about - natural gas is no answer, coal and wood creates supply problems and electrical is pretty power hungry.

Similarly transportation and internet servers (I think internet access of a decent speed is fast becoming an important human neccessity for both business and education) consume a lot of energy that will be difficult to replace.