i absolutely agree with conservation- Wall-E was not about conservation...WSJ had an interview with Lassiter last week in which he said the big oil is the big bad guy in Cars 2...
http://blogs.wsj.com/speakeasy/2011/06/20/with-cars-2-john-lasseter-gives-a-franchise-a-tune-up/
I agree completely. Sloth and waste were the themes of Wall-E. Real happiness only comes when the characters work for their own reward. "Waste not, want not" comes from my Depression era parents and does not go hand-in-hand with Gaia worship and misanthropy that is the heart of environmentalism.
From the WSJ article, it's pretty clear that Lassiter is trying to make a political point in Cars 2 despite his claim otherwise in the OP. What a disappointment. I'll make sure my 5-year old understands this when we go to see it.