~ concern about agriculture and negative environmental impacts intensified in developing countries in the 1970's
~ ecologists criticized the green revolution for relying too heavily on pesticides and fertilizer
~ ecology is the central pillar of sustainable agriculture
~ farmers use countermeasures to respond to stresses and shocks
~ green manuring: tilling fresh plant material into soil to improve its physical it's physical and biological qualities
~ producing enough food, fuel, and fiber to meet human needs is a major objective
~ improving environmental quality! using non renewable resources efficiently and ensuring that farmers can earn reasonable livings from their products

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Sustainable Agriculture