CAS GE 100 Lecture Notes - Lecture 10: British Thermal Unit, Urban Heat Island, Municipal Solid Waste

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The economy looks self-sustaining, but it can"t be- we can"t create/destroy. Rely on various energy sources (shortwave solar radiation in (solar), long wave out (heat), geothermal, hydroelectric, fossil fuels) No energy conversion process is 100% efficient- waste heat always generated. Natural resources also drive the economy- timber, coal, precious metals, 80% of energy inputs come from non-renewable resources. Of work needed to raise one pound of water by 1 degf (~~1050 joules) Iran oil embargo in early 1970"s- energy use drops (shortages, etc) Most materials go to atmospheric emissions & domestic stock. Processing- waste produced from processing mined metals (ex- 97% of extracted earth will be waste; only 3% is zinc) Dissipative- weathering, spraying pesticides, release of road salt not all of it does its job. Urban heat island effect- all the asphalt in cities produces a higher temperature in urban areas; albedo effect contributes (absorbs all the reflected light)

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