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.   A Sea Change will focus public attention on this urgent but little-known crisis. It follows retired educator and concerned grandfather Sven Huseby back to stunning ancestral sites (Norway, Alaska the Pacific Northwest) where he finds cutting-edge ocean research underway. His journey of self-discovery brings adventure, surprise and revelation to the hard science of acidification.