Lecture oct 29th

Lecture oct 29th - 28/10/2010 1 Impacts of Humans on...

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Unformatted text preview: 28/10/2010 1 Impacts of Humans on Ecosystems I: lobal Land- se ange Global Land Use Change ENVR200 Oct 28,2010 What is Land Use? • 3500 years ago, Aristotle noted human influence on Humans have transformed the landscape for Millennia the land due to activities of the preceding millennia. • The plains of Levant (Lebanon) were completely deforested during ca . 2600 BC - 138 AD. • However, land transformation accelerated since the Industrial Revolution. • With population growth, agricultural land greatly expanded mainly at the expense of forests. 6 7 ion ld World Land use history! 2 3 4 5 Cropland Area (Milli km 2 ) Old World New Developed ew 1 1700 1750 1800 1850 1900 1950 2000 New Developing (incl. Pac. Devpd.) 28/10/2010 2 Repeating Pattern Across Globe Adapted from: Foley et al., Science, 2005 Agriculture • Roughly 1.5 billion hectares an area about the size of South America – are currently used for crops (12% of the planet’s ice- free land) •Even more land – roughly 3 billion hectares – is used for pasture and rangeland (24% of planet) (c) Arthus-Bertrand Image: NASA, ASTER Science Team Minnesota Minnesota Kansa s Kansa...
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This note was uploaded on 11/15/2010 for the course ENVR 200 taught by Professor Rhemtulla during the Fall '10 term at McGill.

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Lecture oct 29th - 28/10/2010 1 Impacts of Humans on...

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