Inside a greenhouse off Champagne Boulevard north of Escondido, lettuce, cucumbers and tomatoes are being grown in an aquaponic research facility designed to teach others about sustainable farming. The ultimate goal of the center is far loftier: to save the world. The small greenhouse, dubbed the Auqaponics Innovation Center, contains a sophisticated system that uses fish, water and numerous filtration systems. It’s run by Ecolife Conservation, a nonprofit headquartered in Escondido, whose director is Bill Toone, a conservation biologist by training.