This is human heritage with pure humanistic meaning. Tião Alves, an agroecologist and professor at Serta — Alternative Technology Service, in Pernambuco state, Brazil. Image by Rafael Martins ...

While wading through wetlands in the headwaters of the Everglades, where tall, serrated grasses shelter alligators and water moccasins, agroecologist Elizabeth Boughton described one of Florida's ...