Eco-friendly composting toilets already bring relief to big cities – just ask London’s canal boaters

Every day in central London, some 5,000 people manage without access to basic amenities such as piped water, sewerage or electricity. They are London’s boaters; the people who call the city’s network of canals and waterways home. Living on a canal boat is often cheaper than renting a flat, and a growing number of people are being won over by the beauty of the waterways, and the promise of a slower pace of life.