This is a list Barcamps on themes of sustainability, creating a better world, overcoming poverty. Let's learn from each other.
This may not be up-to-date. Try searching for green on this wiki, or doing a web search, e.g. for green-camp OR ecocamp OR (green OR sustainability barcamp OR unconference) - or search for a more specific term depending on your interests (e.g. TransitCamp). See also Barn Camp, "A user generated conference focused on community, education and sustainability."
Upcoming:
Details lacking (either the page is incomplete, or this table is not filled in yet):
See also Barn Camp? "A user generated conference focused on community, education and sustainability".
Past conferences: