Equating obesity with environmental collapse?

Wall-E is a story about consumerism not obesity. It's about a government run by the CEO of a retail chain and how profits and ecology usually don't get along so well. It's a cautionary tale about how blindly following a corporate entity that insists it can provide everything people need to exist by catering to their every whim to the point where they don't have to lift a finger for themselves anymore isn't such a good philosophy.

It's about taking charge of your own life and giving a damn about more than having the latest gadgets and personal conveniences!