The American Physiological Society (APS) has created a wide range of teaching resources through its collaborative digital library over the past several years. This particular corner of the site brings together a number of environmental ethics case studies which cover everything from GMOS to the fluoridation of drinking water. Currently, the site contains a dozen different resources, including "Food Aid and Population Control," "Reviving Extinct Species," and "Progress vs. Family Tradition." Resources can be filtered by Grade/Age level or even Pedagogy. Additionally, users are encouraged to craft their own resources and submit them for possible inclusion.