y
It is widely used now in the world, but you could consider it an alternative to coal
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Currently, the most efficient alternative energy source at around 95% in the case of large hydropower dams, and 90% for smaller ones, tied with tidal power (not widely used).
1.source energy. 2.alternative energy.
solar energy
Filipino is the main language used in the Philippines.
Chiropractic treatment is the most widely used of all alternative medical treatments
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Wind energy is the most commonly used alternative energy source in Texas. 79% of all renewable energy generated in Texas in 2006 was wind energy.
Yes
In some cases, or even in most, alternative energy is expensive to produce. Energy such as coal or gas, which can be found in the earth are far less expensive to obtain. Solar heating panels can heat your whole home but few can afford the $5-6000 it would cost.
It is widely used but not as much as hydrocarbons and hydroelectric. Japan has extensive nuclear facilities, Europe has many.