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chapter 23 - Grotzinger Jordan Press Siever Understanding...

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Understanding Earth Chapter 23: THE HUMAN IMPACT ON EARTH’S ENVIRONMENT Grotzinger • Jordan • Press • Siever
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The Earth at Night (an energy-intensive civilization)
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Reclamation as an integral aspect of coal extraction
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Consequences of the modern world (built on Earth resources) Effects on the Earth system (including humans) related to: – extraction – refining – consumption – disposal
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Acid rain effects SO 2 + H 2 O H 2 SO 4 Current technology allows (& Clean Air Act requires in the U.S.) the capture of SO 2 from coal-fired plants, smelters, oil & gas refineries, etc., e.g. SO 2 + CaCO 3 + H 2 O CaSO 4 • 2H 2 O (gypsum)
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Health Consequences BBC.com
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Global Energy Consumption (and projected future demand) – where is the supply?
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Global Energy Supply Evolution (resource use changes for various reasons)
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U.S. Oil Production Peaked in 1970 Global Oil Production Peak when?, but decline is inevitable (non-renewable resource)
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Lots of petroleum in Texas, so we must be OK in terms of energy supply?
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TEXAS PETROLEUM RESOURCES ! Each Texas resident consumes 6+ gallons of oil per day ! TEXAS IMPORTS ~2/3 OF THE OIL IT CONSUMES!
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Energy Production (transfer from one form to another) 35 Q 56 Q (61% wasted) Future energy – improved efficiency important, as is reducing per capita use What can we do? -- the way forward (holistic approach)
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“ALTERNATIVE” ENERGY RESOURCES Geothermal Resources – electricity generation limited to specific areas with anomalous near-surface heat
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