Leaving Greenpeace

I joined Greenpeace as a teenager in the eighties, but now I'm thinking of leaving them. It's not that I'm outraged at something they've done or not done; I'm not dissatisfied with them at all. In fact I don't know why I'm leaving them at all.

One of the best things about them was that they provided information. Now with the internet I can do all that myself. Also, I don't think they like the same political ideas as me. Another thing is that I'm concerned that Greenpeace is more like a proprietary software company but I'd like it to be more like an OpenSource project.

Update 2010-04-30: Greenpeace has replied.