Loss of oysters is bad, and Massachusetts Audubon is trying to fix that at an Audubon sanctuary in Massachusetts (see photo).
Wellfleet Bay might have a few (thousand) more oysters soon, thanks to efforts to build habitat for baby oysters. This is a good project, relying on natural oyster reproduction and using human intervention to replace and restore a missing ecological element--massive mounds of oyster shells that provide a suitable home for baby oysters. Human intervention to replace something that's missing because of us. Makes sense, and it just might work.