The past century of sanitation has been an environmental and financial nightmare for the world.
It is supposedly the 100th anniversary of the modern lavatory, though there is some dispute about when the modern flush toilet as we now know it was invented and by whom. Nevertheless, for the billions around the world who take their daily convenience for granted and for the remaining billions who have no access to modern sanitation, it is a good opportunity to sit and think about the future of human waste, of which millions of tonnes is generated every day.