Geoffrey Supran (left), Harvard climate science PhD candidate Ploy Achakulwisut (middle), and other volunteer security marshals clear the way at the front of the People’s Climate March in New York City. Shadia Fayne Wood May. 9, 2016 Facebook Twitter Reddit Print Geoffrey Supran (left), Harvard climate science PhD candidate Ploy Achakulwisut (middle), and other volunteer security marshals clear the way at the front of the People’s Climate March in New York City. Shadia Fayne Wood