Various sources of energy in life (Physics)

1. solar energy, energy from sunlight, inexhaustible, and pollution-free. However, the current technology is not mature enough, limited only to water heaters, solar power generation device efficiency is low, high cost, the scale can not be expanded

2. Nuclear energy, radioactive elements decay, will lose a small portion of the mass of these masses in the form of energy radiated, and then be utilized to generate electricity. Energy output power, no pollution. But the safety risk, high technical requirements, and the use of the device are radioactive, aging replacement, difficult to deal with.

3. Wind energy, power from the wind. Clean and pollution-free, low cost, the scale can be built very large. But the wind is required to be strong and stable in strength all year round, and such places are limited.

4. Hydraulic power, mechanical energy from water, clean and pollution-free. Requirements for water kinetic energy, generally built in the big drop waterfall, and if the construction of hydroelectric power plants, the river ecological harm.

5. Fire, from the combustible (generally coal) combustion energy release, low cost, but produces more substances, the pollutants required to deal with high.

6. Tidal energy. Kinetic energy from seawater, clean and non-polluting, but harmful to the surrounding coast, may cause somewhere the waves wildly large, the reason is currently unknown.