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Energy (what is it?)

Solar 

Photovoltics (Solar Cells, Solar Panels)

Wind (Turbines, Mills)

Plants

Food

Bio-Fuel (Switch grass, Wood chips)

Algae (Clean Smoke Stacks, Ocean Farms)

Fossil Fuel

Crude Oil

Coal

Natural Gas

Tar Sand

Oil Shale

Heat & Light: considerations in building construction

Hydropower

Hydroelectric Dams

Water wheels

Tides

Waves

Nuclear

Fission

Fusion

Cold Fusion

Geothermal

300-700F to Generate Electricity

Medium Temperature (68-300F)

Heat Pumps

Alternative - Natural - Green - Free