Garrett Hardin has written extensively about the biological, ecological and social impacts of various approaches to allocating natural resources. His work has been based largely upon the theory of the tragedy of the commons, population genetics and the application of biological principles to analogous social processes. He points out that policies that are morally appealing, because of their short-term benefits, may lead to disaster in the years ahead. His recommendations have stimulated considerable controversy and have been the object of moral criticism. They should not, however, be dismissed without careful consideration.