One adventure of the 21st Century? Re-using the pieces of broken systems to invent new ways of living… “The ruins of the unsustainable are the 21st century’s frontier.” […] Today, I see it more as a promise. That is, it’s a foregone conclusion that huge systems all around us are about to break apart (they’re unsustainable, and that which can’t go on, doesn’t). That doesn’t have to mean — at all! — that what comes after will be worse.I don’t mean post-apocalyptic utopias.