There are a great many reasons why the toilet should be reinvented. First among them is the huge amount of water we use for flushing them – at a time when there are droughts in many parts of the world, it is shortsighted and wasteful. Bur there are other reasons. It is wasteful to flush away urine and feces, when they can be used to generate biogas, or dried and mined for minerals. The people who are reimagining the sanitation industry for the 21st century call them ‘toilet resources’.