I beg to differ. My son came home from Scout Camp insisting that his siblings do a plot study in our back yard.
That's great, but the question posed by the Cornell Study is, will your son's appreciation for the environment stay with him into adulthood, as a result of Scouting?
As a Scouter myself, I can say that Scouting has very much increased my awareness of environmental issues (altho I still think Algore is full of hot air!).
But, in my own case, I don't think I developed that awareness as a child in Cub Scouts -- it came about due to my involvement as an adult.
I hope your son sticks with it!