Modern industrial agriculture is not sustainable because of its heavy
reliance on petroleum, a non-renewable source of the energy used in
farming, and because of pollution caused by petroleum products such as
fertilizers and pesticides. A systems analysis of farming suggests that
agriculture will be more sustainable when services of nature, such as
nutrient recycling by soil micro-organisms and natural controls of
insects, replace the services now provided by energy from petroleum.
Examples are drawn from the Southeastern USA, but lessons learned can be
applied worldwide.