Presentation on theme: "Energy Humans use varied energy resources Most came from solar energy Decomposition of plants, animals buried underground form fossil fuels Which."— Presentation transcript:
Energy Humans use varied energy resources Most came from solar energy Decomposition of plants, animals buried underground form fossil fuels Which are non- renewable?
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
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
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
Desert areas have potential for solar, geothermal power Coastal areas for wind generation and tidal power Renewable energy sources
Hydro- electric Moving water turns turbines to generate electricity Most rivers are already dammed Causes problems for fish, downstream habitats
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
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?