Contact: Leigh Stearns, 581-1491; Susan Kaspari, 288-2046ORONO — The UMaine Sustainability Alliance has organized a slate of Earth Day activities for April 18, which include environmental and conservation discussion groups, the screening of Al Gore’s “An Inconvenient Truth” and by releasing 50 “green bikes.”The day also will feature Maine-produced foods in the Bangor Room of read more UMaine Observing Earth Day with Climate Change Film, Discussions and Return of ‘Green Bikes’