I wonder how you feel about Ducks Unlimited then. It's the biggest (to my knowledge) non-government organisation that works towards preserving and restoring wetlands. No other "green" organisation comes close. Sure, it's almost all hunters that support it, but it's not just so there is a place to hunt, it's to preserve what we have for the next generation. This is what ethical people who enjoy the outdoors do. This is also what sport fishermen are supposed to do.
I grew up being taught how to respect the environment. I pack out what I pack in (trash etc.) and don't leave things like spare line left. It all comes back in for me to get rid of properly.
I love the outdoors. I love animals (seriously, my house growing up was like a zoo). And I have a pretty big interest in living things and eco-systems. I recently went out west with work and there was one of those tree hugger types in our group. She started the week off in bashing hunters not realizing there were a few of us in the group. By the end of the week, this know it all realized she didn't know much and each time she saw an animal she ended up coming to these experienced outdoors people when she had a question.
I pointed on what commercial fishing leaves behind, and you illustrated that, so I'm not disagreeing you about that. But, it's irrelevant to this conversation, unless you're supporting sport fishing as a better way for people to get their fish.
I wonder how much time these "greenies" spend in the outdoors and how educated they really are about the subject.