By the end of the 20th century, nearly 80 percent of Americans lived in urban areas. And they no longer knew who grew their food. Then something happened. Across America, an urban farming movement began. Whether it’s on city rooftops, beside freeway off-ramps, in vacant lots, and even in front yards, when people like Novella Carpenter in Oakland, California grow food in cities it reconnects them to where their food comes from.