I just came across the January 2011 issue of English Journal (vol. 100, num. 3), which had the theme of Green English. The journal is aimed at middle and senior high school English teachers, but a lot of the ideas and activities are totally relevant to ESL or EFL contexts. Several of the articles discuss class projects, while others deal more with theory. They have articles on bringing environmental issues into the English classroom, and also some on taking a more place-based approach.
You need to be a subscriber (or belong to a library that subscribes electronically) in order to read the full articles. If you have access, though, it’s worth checking out.