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Published byAubrie Goodwin Modified over 9 years ago
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Energy Humans use varied energy resources Most came from solar energy Decomposition of plants, animals buried underground form fossil fuels Which are non- renewable?
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How fossil fuels are formed 1. Plants and animals collect in layers of mud in a shallow sea 2. Layer is buried, heated, pressurized 3. Rock is bent, oil is trapped with natural gas above and water below
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global energy sources global energy sources Fossils fuels are non-renewable 88% is from fossil sources Burning creates CO 2 Fossil fuels will someday run out
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Past and future energy use
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Which countries consume the most energy?
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Alternative energy sources Solar Wind Geothermal Nuclear Tidal Hydroelectric Biofuel We are searching for other sources of energy Renewable resources will not run out Environmental impacts could be much less
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Desert areas have potential for solar, geothermal power Coastal areas for wind generation and tidal power Renewable energy sources
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Hydro- electric Moving water turns turbines to generate electricity Most rivers are already dammed Causes problems for fish, downstream habitats
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Reducing energy waste All forms of energy generation waste energy Power plants are only 35% efficient We need to reduce our energy use and energy waste 157 mpg car
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Review 1.Where does most energy for life come from? 2.Is oil a renewable resource? 3.How much energy does the US use compared to the world average?
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