4_Chap%202_Changing%20Environment

4_Chap%202_Changing%20Environment - Geological Base;...

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Geological Base; Climate & Climate Change; Water; Human Impacts on Plants & Animals; Food Resources
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c Trash at Mt Everest Base Station c Trash litters many rivers rash on the shores of c Trash on the shores of the Outer Hebrides Islands
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Cuyahoga River burning: in 1952 Image Ohio Historical Society Time Magazine called the river that "oozes rather than flows" and the late night talk show hosts made fun of it. But now the river has come back: Forty years ago, Cleveland's Cuyahoga River caught fire. It was not the first time a river (even the Cuyahoga) caught fire, but like Apollo 8's earthrise photos, it became an important event in the raising of awareness of environmental issues in America. "The burning river mobilized the nation and became a rallying point for passage of the Clean Water Act,“
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Relatively New theory – 1960’s – Sea Floor Spreading Alfred Wegener – 1915, Continental Drift Theory
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1. Physical Continuity 2. Biological Continuity 3. Material and Structural Continuity 4. Climatic Continuity
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c Plate Tectonics/Continental Drift : Similar Theories c About 250mya” Break-up of SUPERcontinent Pangaea c Formation of Tethys Sea (image) - Atlantic c Movement of India to create Himalayan Mountain Range c Formation of major fold mountain ranges along leading edges of North and South American Plates c Human scale, earthquakes & volcanic activity on plate boundaries c Collapse of Reptiles as dominant species c. 65 mya, probably because of impact of asteroid in Yucatan c Tectonic theory: developed 1960’s and is accepted by almost all scientists throughout all geoscientific disciplines
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c Climate change: natural, anthropogenic, or both ? c Glacial, interglacial: s Cyclical – 100,000 year ice ages then INTERGLACIAL periods c Burning hydrocarbons produces carbon dioxide. CO2 main contributor to Global Warming
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4_Chap%202_Changing%20Environment - Geological Base;...

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