Bembles

Hi! I've just moved to Dulwich, and really like the feel of the place, but don't know too much about it and work limits the time I have to go exploring. Can anyone recommend any shops/societies/whatever with particularly ethical/environmental/campaigning attitudes? In Sheffield, I volunteered in a not-for-profit wholefood that got involved with the community, and organised cool events...just wondering if there's anything similar in Dulwich? Any advice greatly appreciated! xxx