The planet's prodigious poo problem

Each year, livestock produces billions of tonnes of excrement. It's starting to poison the natural world. So what is to be dung?Recent research has estimated that by 2030, the planet will be generating at least 5bn tonnes of poo each year, with the vast majority being deposited by livestock. With 80% of farms in the Netherlands already producing more cow dung than they can legally use as fertiliser, and China resorting to drastic measures to try to reduce the amount of manure being discharged into rivers, scientists say this is a major environment and health challenge. Continue reading...