Which one of the following fuels is considered environmentally-friendly?

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Coal

Petroleum

Natural Gas

Firewood

answer is C.

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Detailed Solution

Natural gas is considered to be environmentally friendly. Sources of energy can be classified as conventional and non-conventional sources. Conventional energy sources are natural resources that have been in limited quantities for a long time. They are also called non-renewable resources because once they are depleted, they take millions of years to form—for example, coal, natural gas, electricity and petroleum.
On the other hand, non-conventional sources of energy, also known as renewable resources, are those which are continuously replenished by natural processes. These cannot be exhausted easily—for example, wind energy, biomass, firewood, thermal energy, solar energy, etc.

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