Arcosanti is a settlement 70 miles from Phoenix, Arizona, and “a curious taste of what an environmentally friendly US town could look like, but probably never will. It was designed by Paolo Soleri, an Italian-born architect, who originally came to Arizona to work for Frank Lloyd Wright, but soon set off on his own idiosyncratic path… Today, as the world wakes up to the grim realities of climate change, peak oil and sustainability, Soleri’s path looks less idiosyncratic. In fact, he’s now something of a guru.”