Ehh, I'm not the guy to be fishing two pound test just cause I think it'll help me fool a fish. I'm a large proponent of fishing the heaviest tippet you can (I usually use 3x for nearly everything) so that you don't stress the fish out. I'd rather sleep a little better knowing I didn't leave a bunch of tippet in the stream and maybe I caught one or two less fish, though I don't find that I usually catch any fewer fish with heavier tippet. Also, as a reference, most tippet materials won't biodegrade for around 500 years. I'd imagine making that a practice of leaving tippet in our waters does more damager over time than the death of a single fish, which, let's be honest, probably isn't going to die if you fight correctly and handle correctly once it's at your feet. And even then, say your tippet gets wrapped around a tree in a current, and that fish you just snagged gets stuck and can't move but the 18" of tippet that's sticking out of its back; where does that leave us? Just my 2 cents, but I probably still owe a few more.