by Katharine Mieszkowski, Salon, USA - Human waste can be extremely toxic. It can carry millions of bacteria, viruses and worms. And you don't want that kind of stuff lying around. But these 2.6 billion people, who have absolutely no sanitation, have no choice but to use the nearest bush or roadside. That means it's being tramped around in the human environment. It's getting into people's food, it's getting into their water, and it's making them extremely sick.