Founded by Lawrence Carota in 1997, Vancouver-based Ocean Tides Productions crafts industrial and training films, interactive CDs, and, most importantly, documentary films about people and the issues they face. Having delivered such classics as “Keepers Of The Light” about the automation of lighthouses worldwide and “A Nurse’s Opinion,” a prescient look at nursing in Canada’s healthcare system, Carota, a filmmaker for 35 years, shot and edited potentially his most far reaching documentary, “Crude Sacrifice” (www.crudesacrifice.com/), over the last three years. The innovative work examines the adverse health effects on residents in Northern Alberta who live downstream of the Athabasca Tar Sands, the world’s largest oil-development project. The extraction is Canada’s largest producer of greenhouse gases, accounting for almost one percent of all greenhouse gases in the world