London: Short of starting a farm, what can we do to make our cities more sustainable?
Mollison: Catch the water off your roof. Grow your own food. Make your own energy. It’s insanely easy to do all that. It takes you less time to grow your food than to walk down to the supermarket to buy it. Ask any good organic gardener who mulches how much time he spends on his garden and he’ll say, “Oh, a few minutes every week.” By the time you have taken your car and driven to the supermarket, taken your foraging-trolley and collected your wild greens, and driven back home again, you’ve spent a good hour or two — plus you’ve spent a lot of money.