Marshall's Categories of Environmental Ethics
There have been a number of scholars who've tried to categorise the various ways the natural environment is valued. Alan Marshall and Michael Smith are two examples of this, as cited by Peter Vardy in "The Puzzle of Ethics". For Marshall, three general ethical approaches have emerged over the last 40 years. Marshall uses the following terms to describe them: Libertarian Extension, the Ecologic Extension and Conservation Ethics.
Read more about this topic: Environmental Ethics
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