Imagine using New York City’s 12,000 acres of rooftops to grow vegetables. Women in Manila weave stylish handbags from discarded newspapers. In a remote corner of Brazil’s Amazon forest, the Ashaninka Indians have opened a school to pass along tribal knowledge. A protective cocoon fits over a stroller to keep out pollution. Using palm oil as a biofuel is not without controversy. In Israel, cow manure is used to generate electricity.