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achieve activities agriculture animals areas Barry Commoner basic become belief systems capital carrying capacity centres cities Club of Rome communities competition complex concentration concept conﬂict consumption costs course crisis crops cultural decision-making dependent developing countries development assistance ecological economic growth economists ecosystems effects efficiency environmental problems example fact factors farm fertility ﬂow functions future goals Green Revolution groups human ideology important income increase individual industrial industrialisation inﬂuence institutions intemational Kcal Kingsley Davis labour land less Limits to Growth Lugo manís measures ment migration nations natural environment natural systems nomic Norbert Elias organisation percent photosynthesis plants political pollution population growth possible potential production raw materials reﬂected reform relationship result revolution rural soil solar energy solution specialised steady state society strategy structure survival tion underdeveloped United University of Florida urban urbanisation yields