Nobody leaves a smaller footprint than a long-distance cruising sailor, who has to live for a month or more on the food, water, fuel and other supplies that can be packed into a boat with a living area about as big as a sheet of plywood. And no cruising sailor leaves a smaller footprint than Annie Hill or Trevor Robertson, whose radically simple lifestyle was specifically designed for boat life – but would serve equally well anywhere else. Annie is the author of Voyaging on a Small Income, the classic how-to manual for voluntary simplicity afloat.

Trevor Robertson, Annie's husband, independently adopted the same minimalist lifestyle long before he and Annie married. Living aboard their boats, the two have seen the world from Greenland to New Zealand, from Brittany to Buenos Aires. Between them, they have sailed more than 300,000 miles – and although very few of us will emulate them directly, all of us can learn from them just how little we need by way of material possessions to have a rich, rewarding and satisfying life. Our interview with these two remarkable people is now up on the Green Interview site. It's a fascinating story. Please take a look.

Coming next, in a couple of weeks: Alexandra Morton, the warrior-scientist who has devoted her life to defending wild salmon against the effects of industrial fish production in the open sea. You can see an eight-minute excerpt from that interview here:  http://www.youtube.com/thegreeninterview#p/u/0/V6Y3yYwRgiY