"It's not THAT bad, not as bad as SOMETHING ELSE, so we should all worry about this other thing first"
That's such a pointless argument. if you believe in something, then you believe in it from all angles. If they can pollute just a little less by not riding snowmobiles, and they want to do so, then more power to them.
calling them hippies is stupid, they are doing something they think is right, even if you dont care, which is respectable.