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Renewable Energy Alternative (Biomass (No net change in atmospheric carbon…
Renewable Energy Alternative
Biomass
No net change in atmospheric carbon dioxide
Takes away land from food crops or natural habitats
Methane "landfill gas" produced by breakdown of waste in landfills
Large energy input is neede
Liquids: ethanol and biodiesel
Solids: wood, charcoal, manure, agricultural and timber waste
Used for heating, cooking, lighting, vehicle fuel, electricity generation
Energy is called bio power which is produced by burning biomass
Makes up living organism
Geothermal Energy
Underground heat generated by high pressures and breakdown of radioactive elements
Accessed by drilling below ground
Causes must less air pollution than fossil fuels
Low greenhouse gas emissions
Not sustainable if hot groundwater is used faster than it is naturally replenished
Hydropower
Generated by turbines turning by moving water
Water flows through a dam and pushes turbines
Naturally flowing water is diverted through turbines
Completely renewable
No air pollution or greenhouse gas emissions
Dams alter ecosystems and affect organisms (fish)
Tidal Energy
Electricity generated by the flow of ocean water as tides go in and out
Tidal waters push turbines in a dam
Generated no pollution
Thermal Energy from the Ocean
The ocean absorbs solar energy and stores it as heat
OTEC converts heat energy in the ocean to electricity
Warm ocean water is used to boil liquids with very low boiling points, generating vapors that can spin turbines
Solar Energy for Heat
Passive Solar Heating- designing a building to efficiently capture, store, and distribute the sun's energy- used to heat homes and businesses
Active Solar Heating- Uses technology, such as solar panels, to capture, store, and distribute the sun's energy
Solar Energy to Make Electricity
Photovoltaic Cells- convert solar energy directly into electricity
Concentrating Solar Powers- uses mirrors to focus the sun's rays on a vessel containing fluid
Wind
Wind turbines convert wind's kinetic energy to electrical energy
No pollution or greenhouse gases produced
Hydrogen
Can be combusted to produce heat, with just water as a byproduct
Inexhaustible supply of hydrogen
Water and heat might be the only byproducts
Hydrolysis is expensive, and breaking down methane yields carbon dioxide