In ‘The Future of Cities,’ innovative responses to urban issues

More than 31 cities around the globe with populations of more than 10 million people are considered megacities. As the number of city dwellers increases, so do problems like overcrowding, pollution, housing and aging infrastructure. The online mini-documentary, “The Future of Cities,” explores the ways citizens are mobilizing to address these issues. NewsHour Weekend’s Ivette Feliciano reports.