Key points are not available for this paper at this time.
Ecosystems, Agricultural Systems and Energy The Beginnings of Agriculture Agriculture in Prehistoric and Historic Times Transitory Agricultural Systems Settled Agriculture: Arable Systems Settled Agriculture: Pastoral Systems Settled Agriculture: Mixed Farming Systems The Environmental Impact of Agriculture in Middle and High Latitudes The Environmental Impact of Agriculture in Low Latitudes New Developments in Agriculture.
A Sat, study studied this question.