Imagine a world without fish. It seems inconceivable. But top scientists warn that such a catastrophe may in fact play out in coming generations unless widespread awareness is raised to stop ocean acidification. The movie, “A Sea Change,” focuses public attention on this crisis. Every other Monday Transition Whidbey welcomes you to attend a free movie and discussion. Screenings are at the Bayview Senior Center, 14594 Highway 525 in Langley) at 7 p.m. For information call 360-221-0506.