Abstract
Die mens se verhouding tot sy omgewing nader in baie dele van die wéreld 'n kritieke stadium, want die veranderinge wat plaasvind, kan onomkeerbaar wees en onvoorsiene, verreikende gevolge hé. Baie van hierdie omgewingsversteurings begunstig die korttermynvermeerdering van mensgetalle, maar dit het langtermynnadele ten opsigte van oorlewing. Hoe meer gesofistikeerd die landbou word, hoe groter is die versteuring van natuurlike ekostelsels en hoe groter is die persentasie van die energievloei binne die stelsel wat vir menslike gebruik ingespan word. Nieteenstaande die sogenaamde Groen Revolusie is die per capita produksie van grane in die Derde Wêreld tans onderkant die vlak wat dit 25 jaar gelede was. Gronderosie speel ook 'n belangrike negatiewe rol in verskillende dele van die wêreld en die toenemende gebruik van kunsmis het 'n nadelige effek op grondchemie.Copyright information
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