There are tribes in the Amazon rainforests who never use motorised transport, and in wooded Welsh valleys a few bold souls subsist without gas or mains electricity, but Joan Pick is doing it in Croydon.
After 36 years of self-imposed environmental abstinence, Miss Pick, 67, is now being recognised as an eco-heroine with one of the smallest carbon footprints in the country.
She never heats her flat and eats all her food raw. She has avoided travelling on any form of motorised transport since 1973. Instead, like a Yanomami hunter, she travels on foot, jogging 12 miles a day across the suburbs of southeast London.