The last session I attended at Library Camp was "Green librarianship: recycle, reuse, both print and e-tools, paper alternatives, green leadership in our inst., collaborate with publishers, hardware vendors." It was conceived and facilitated by Brita Servaes. I was thrilled that the topic was even proposed, and that the discussion was attended by at least 20 people (which is about the same as the other sessions I went to--20 out of 150 people when there were 8 sessions to choose from).
Read more, or you might want to read my overview of the whole day first.