I think Salopian hit the nail. Yogi's point is about getting more efficient. How we do that has many aspects about our daily lives as Yogi pointed out. The specific ways of increasing efficiency will change as technology changes.

Me? I chose not having kids to conserve. I think I conserved more energy than any other methods that will come along. That's why I don't feel the need to 'conserve' and drive a little beercan of a car that'd loose a bout in the Tijuana Grand Prix destruction derby I deal with every day. I have no guilt about buying a new big truck this year. Yes, I'll probably buy a more efficient one than the last, but it'll be an economic decision.