Lecture 1 Outline - Many densely populated regions now near...

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People and Geological Hazards 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 . Natural disaster:  When geological hazards impact people . Mitigation Mitigation-reducing or eliminating a hazard Risk identification Planning Warning Evacuation Rescue and Relief efforts Mitigation Mitigation is expensive…part of hazards costs Costs Casualties Property damage Rescue and relief efforts Costs Mitigation efforts in countries like the US has greatly diminished casualties but… Global Population Densities Many densely populated regions now near geologically active zones.
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Unformatted text preview: Many densely populated regions now near geologically active zones. Population pressures will lead even more people to live near geologically active areas World Population Improved medical knowledge and mechanized agriculture since 1850. Has allowed human population to grow exponentially . Exponential growth: amount increases faster the larger it becomes. Human Impact on Environment: Examples Can change local ecology: change in vegetation = change in erosion Change surface water flow = desertification, change in flooding patterns. Change atmospheric chemistry: ozone, CO 2 = climate change Alter landforms: mining, building = increase erosion and flooding...
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Lecture 1 Outline - Many densely populated regions now near...

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