London 21 promotes, supports and networks those engaged in community-based action for sustainability in the Greater London area. Currently (March 2005), over one and a half thousand organisations and individuals are involved in the London 21 Sustainability Network. It provides information services including a monthly e-newsletter with London-wide news and events listings, e-mail discussion groups, a quarterly printed newsletter and a website with a directory of contacts and community based project case-studies, and news and events listings