Part of the series Future L.A.: Engineering a Sustainable Supercity Three Megacities: A Comparative Approach WEDNESDAY OCT 3, 2018 7:30PM  Mexico City, Tokyo, and Shanghai—megacities with populations of more than 20 million and with unique infrastructures—have in recent years all made pledges toward total sustainability. What can Los Angeles learn from their triumphs and struggles? Moderated...