electricity Nuclear renewable? U lasts 80 years. E not for transport, heating. Biomass next chap 29.
Charcoal=anaerobic heating=carbon+ash, like coal.
wind Windmills 800 Ys pump water. 40K birds/40M comm. towers, x00M cats.
Humpback bumps (tubercles) on flipper leading edge. WhalePower biomimicry also ceiling fans.
What's inside a wind turbine? World's Largest Windfarm Sets Sail (London Array) Offshore wind farm on Evanston’s horizon? DeKalb-Lee Wind Farm Noise
solar-thermal add "system"; active: circulate water.
solar-passive not generate e; greenhouse/alligator. Overhang: not at equator. Trees. Concentrated solar power? Thermal mass at Rocky Mountain Institute Touring the ultimate 'green' house: thermal mass at Rocky Mountain Institute Solar Cooking Largest concentrated solar power plant opens in Abu Dhabi (3/18/13)
solar-pv Polycrystalline, Thin-Film semiconductor: CALCULATOR: 14% - 44% efficient.
Assume $50/500 KWH per mo. Naperville Home Solar Power System Cost Calculator
geothermal Radioactive decay + pressure. Geothermal Heats Up (QUEST) Geothermal Energy Worldwide Map
heat_pump 55°F(13°C) 150 feet deep. Cheap pump: BASEMENT. heat pump using refrigerant liquid/vapor, or antifreeze Geothermal heating and cooling Earth-Bermed House: heat pumping to the max
hydropower Upstream submerged/cold bottom, downstream low/warm, block fish.
Joseph/John Naper sawmill to cut lumber - Mill St..
Fish Ladder at Grand Coulee Dam
efficiency 8K hours; mercury from coal plants. Office & classrooms
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Samsø Island: Denmark contest. Onshore + offshore turbines -> 75% of electricity. $600/share turbine.

PV cells subsidized. 4% of deserts covered in PV cells -> all electricity needs.

CSP on 100 square miles in Nevada -> electricity for U.S.

2007 geothermal earthquake Basel, Switzerland.

Clean coal chap 23.