Lecture 8-27-08

Lecture 8-27-08 - Environmental Sciences and Society: An...

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Unformatted text preview: Environmental Sciences and Society: An Overview Key Issues Population growth- how many people? Resource use? Land use? Global change (climate + direct human alterations) The BIG THREE: Energy, Water, Food Increased energy use, fossil fuels, and impacts Increased demand for freshwater, human/ecol health Food production/distribution inefficiencies, impacts When human populations were small and dispersed, their impact on the landscape was minimal Human traces were minor A Quichua garden (called a “chakra”) created by clearing a patch in the rainforest, planting vegetables among the downed trees to grow in the soil nutrients. Chakras were abandoned after several years, new ones cleared. Sustainable only with low population densities. A Bedouin encampment in the Negev desert: nomadic pastoral agriculture. Several thousand years of heavy livestock grazing has degraded the landscape. Contemporary western society: concentrated urban centers, requiring massive inflow of resources from the surrounding region.massive inflow of resources from the surrounding region....
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Lecture 8-27-08 - Environmental Sciences and Society: An...

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