Nonrenewable energies come from combustion of coal, oil, and natural gas. Their creation took millions of years, and we are using it faster than it was produced and faster than it is being created. Renewable energies come from the sun. Collection is from natural occurrences. While the energy is free, it costs money to collect it.
Greenhouse gases threaten to increase the temperature of the Earth with long-term consequences. These are extremely lengthy processes, and there is debate about the cause and effects. Coal provides a cheap, efficient source of heat, but it creates pollutants and CO2 through its combustion. Developing countries such as India and China rely heavily upon coal and thus have high concentrations of pollution. Far more pollution is expected from them in the future unless they can be convinced that renewable energy is preferable.
“ It is pleasant, when the sea is high and the winds are dashing the waves about, to watch from shore the struggles of another.” Lucretius, 99-55 B.C. An Introduction to Wave and Tidal Energy Frank R. Leslie, BSEE, MS Space Technology 5/25/2002, Rev. 1.7 firstname.lastname@example.org; (321) 768-6629 Renewable Energy in (and above) the Oceans
A floating buoy can compress trapped air similar to a whistle buoy
The oscillating water column (OWC) in a long pipe under the buoy will lag behind the buoy motion due to inertia of the water column
The compressed air spins a turbine/alternator to generate electricity at $0.09/kWh
220.127.116.11 020402 The Japanese “Mighty Whale” has an air channel to capture wave energy. Width is 30m and length is 50 m. There are two 30 kW and one50 kW turbine/generators http://www.earthsci.org/esa/energy/wavpwr/wavepwr.html
Energy trade-offs required to make rational decisions
PV is expensive ($4 to 5 per watt for hardware + $5 per watt for shipping and installation = $10 per watt) compared to wind energy ( $1.5 per watt for hardware + $5 per watt for installation = $6 per watt total )
Are Compact Fluorescent Lamps (CFLs) always better to use than incandescent?
Ref.: www.freefoto.com/ pictures/general/ windfarm/index.asp?i=2 Ref.: http://www.energy.ca.gov/education/story/story-images/solar.jpeg Photo of FPL’s Cape Canaveral Plant by F. Leslie, 2001 7.1 020315