How to harness natural energy and not pollute? Here is a list of the types that I can find:
Biomass
Anaerobic Digesters
Biodiesel
Waste To Energy
Biomass Gasification
Waste to Fuel
Microbial Fuel Cells
Biogasse
Piezoelectric
Inductive Coil
Thin Film Photovoltaics
Crystalline Silicon
Organic PV
Concentrating Photovoltaics CPV
Solar Chimney
Solar to Liquid Fuel
Solar to Hydrogen
Concentrated Solar Power CSP
Solar Updraft
Photoelectrochemical
Thermoelectric
Damless Hydro
Wave Power
Microhydro
Ocean Thermal Energy Conversion
Geothermal
Osmotic
Vortex Power
Deep Lake Water Cooling
Tidal Energy
Horizontal Axis Turbine on/off shore
Vertical Axis Tubine
Airborne Turbine
Ladder Mill
Kite Wind Generation
Aerostat
Floating
Concentrated Wind
Radiometer
Vaneless Ion
Any others?
