Just don't let her know that she's the biggest environmental disaster that you and the wife have wrought on the planet.My daughter is also a driving force in our house about conservation vs. consumption. She will often ask "Is this recycled?" or "Is this better for the environment?". Maybe she's brainwashed by "green" tv shows, but it makes sense. I don't want to look my 7 year old in the face and say "No, it's not good for the environment, but I am doing it anyway because I don't care." She will also ask "Is that healthy?", so I have also rethought some of the ways we eat.
Somebody is hippyfieing that girl...On Friday we had a neighborhood girl babysit for a few hours. My daughter was watching some TV after lunch, then got up and turned it off. She looked at Liz and said "This isn't very educational, I would rather go to the park and play." Liz was shocked, but gladly took her to the park to play.