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Coal is made largely of carbon but also features other elements such as hydrogen, oxygen, sulfur and nitrogen.

The main use of coal is electricity generation.

Total demand for U.S. coal reached 1.05 billion tons in 2010.

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Facts:

While propane gas is heavier than air, natural gas is lighter.

The natural gas dug out of the earth today was formed about 100 million years ago.

In its pure state, natural gas is odorless.

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Facts:

The methane gas from cow manure can be used to create energy.

Most of the gasoline sold in the United States contains some ethanol.

Farmers create energy from animal manure using tanks called digesters. ...

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Facts:

Wind energy was first developed with windmills in 200 BC in Persia and China.

Wind energy is the fastest growing mode of electricity production across the planet.

The first modern turbine was built in Vermont in the 1940s

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Facts:
Hydropower became an electricity source in the late 19th century, a few decades after British-American engineer James Francis developed the first modern water turbine.

Hydropower is one of the oldest power sources on the planet, generating power when flowing water spins a wheel or turbine.

Hydropower is the most efficient way to generate electricity. Modern hydro turbines can convert as much as 90% of the available energy into electricity