2-18 - active areas World Population Improved medical...

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An Active World 21:40 An Active World Earth: an actively changing planet Earth materials (rock, soils, water, etc…) acted on by internal and external  energy These interactions constantly rearrange mass and heat Interactions are geological processes o Energy + Earth Materials   Change   Population hazard Natural Disaster o When geological hazards impact people Mitigation Reducing or eliminating a hazard o Risk identification o Planning o Warning o Evacuation o Rescue and relief efforts Mitigation is expensive – part of hazards costs o Costs Casualties Property damage Rescue and relief efforts Mitigation efforts in countries like the US has greatly diminished casualties Over-development in hazard – prone area Global Population Densities Many densely populated regions now near geologically active zones Population pressures will lead even more people to live near geologically 
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Unformatted text preview: active areas World Population Improved medical knowledge and mechanized agriculture since 1980 Has allowed human population to grow exponentially Exponential growth: amount increases faster the larger it becomes Expected to double to 12 billion before stabilizing around 2100 Human Impact on Environment Examples o Can change local ecology: change in vegetations = change in erosion o Change surface water flow = desertification, change in flooding patterns o Change atmospheric chemistry = ozone, CO 2 = climate change o Alter landforms: mining, building = increase erosion and flooding o People are sometimes forced to overuse and deplete resources o May increase geological processes and thus hazards 21:40 21:40...
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This note was uploaded on 04/20/2008 for the course GEOL 105 taught by Professor Kohut during the Spring '08 term at University of Delaware.

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2-18 - active areas World Population Improved medical...

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