I think if you look at the themes that are presented in the film, some are inherently social, and I think that any film which deals with the family is dealing with the smallest social unit in our society - and in a sense it is a question of scope.
I was recently looking at what they can actually do to reduce consumption of petrol. It would be quite possible to build automobiles out of carbon fibre that would be just as strong, weigh 10 times less and consume 10 times less petrol.

