Urban Gardening by Necessity
A friend forwarded to me a story on the rise of urban permaculture in Cuba. An Aussie permaculture team visited there during the horrible economic crash and helped get people in Havana started on sustainable agriculture. It's resulted in quite the cooperative culture change.
Going through a minor famine and economic readjustment is not required to start working with permaculture, but it's certainly reassuring, and inspiring, to see that urban gardening can actually substantially feed an urban population. There's a tremendous amount that we could do here in Silicon Valley, given the terrific climate and opportunities here.