Though I do believe in the whole "Global Warming" situation, and I believe that humans are destroying the Earth, it shouldn't be the kids problem!
Instead of figuring out if kids like shooting things more than helping the environment (did they really believe they would want to help the environment more?) why don't they actually do something for the environment or raise awareness. Surveying children sounds like a waste of time.
You might say:
"If the kids aren't really aware, then who's going to get the Earth out of the hole that's been dug for it?" well to that I say
"You, Mr. Thirty-Fourty-something-year-old-Greenie, did YOUR parents ever tell you (In the 60's/70's/80's) that Global warming was going to screw you over? I think not."