Cleaner+Energy+sources

Coal is the next largest energy source used today. It is used mostly to create the steam in boilers, so as to generate electricity or drive large machinery. In many countries coal is still used as a source of heat. Even though coal is used widely across the globe, it does have a sizeable drawback, pollution. When burned, coal releases sulfur and numerous other contaminants into the atmosphere. The chemicals in the air can eventually make acid rain. Even with the installation of filtration devices in factories, the problem still exists.
 * Coal **

Bituminous Sand & oil
The supply of fossil fuels is being depleted at quite an alarming rate. Soon it may be necessary to extract the oil from bituminous sands and oil shale. Bituminous sands are sands that have been covered with oil producing substances. Rocks that can be processed to make crude oil, known as oil shale, may also be a substitution for other types of energy even if it may be more costly. ====

Petroleum
Petroleum is the most commonly used energy source, supplying about 40% of the planet's energy. Petroleum is used to produce fuels, such as gasoline (petrol), diesel, and numerous fuels for heating. This rich energy source is found in crude oil. This substance is pumped from deep beneath the earth. The next step in this process is the processing of the oil in large refineries. Here, many of the polluting factors of crude oil are removed, and gasoline and other fuels are made

Natural gas
Natural gas makes up about 21% of the total energy used worldwide. Used in households and commercial buildings for cooking and heating, natural gas is extracted from the earth (like petroleum). Natural gas is the cleanest burning fossil fuel, as it is refined naturally during its formation within the earth. Because of this fact, the need for large refineries is not necessary

Hydro Power
Hydro Power creates about 7% of the total energy used today. Hydropower, or water power, is the process of capturing the energy of water that falls from a higher point to a lower point. The water turns large turbines which then create electrical energy. Hydropower creates no pollution of any kind and is the cleanest energy source we possess. The only major shortcoming of hydropower is the need for large and very expensive dams



Solar Power
Solar energy, as it is implied in its name, consists of using the sun's energy to provide us with the energy we need. The good thing about using solar energy is that doesn’t pollute the earth at all and it is renewable

Biomass
Biomass serves as another renewable energy source. Wood is the most common biomass fuel, but biomass includes many types of organic matter that can be converted into energy, such as plants, agricultural products and by-products (such as corn and sugarcane residue), animal waste, and even garbage. Biomass fuels can be burned to generate heat and electricity directly, converted to gaseous fuel like methane, or converted to liquid fuel such as ethanol and methanol. Agreement has not yet been reached regarding which types of biomass energy should be regarded as renewable or green energy.

Oil
Oil, which is also known as petroliem is a fossil fuel and, like all other fossil fuel, it was formed somewhere around 300 million year ago, through geothermic processes. We can therefore qualify it as a non-renewable energy source. It is highly combustible today; our modern society depends on petroleum for almost every means of transportation as well as for energy prodction.Its molecular structure makes it a source with many uses in our current age