I'm with Chris L on this thought. I was recycling aluminum and paper before I was serious about cycling. However, it was cycling that turned me into an environmentalist, and not the other way around. I would like to clean up the trash from the roadside because the presence of trash makes my ride home less pleasant; I wouldn't want to clean it up simply because it is there. I ride my bicycle to work because I love to ride my bicycle to work; I don't ride my bike to work because I'm going to save the environment. I don't eat a lot of red meat because it isn't good for me, not because I think people shouldn't eat animals. I choose not to wear leather clothing because I don't want to spend that much money on clothing that I couldn't wear anyway because I'm cycling/sweating all the time.
I don't mind being called a "greenie," even though I know that I'm not.