Which of the following is not a sustainable form of energy production? a. solar b. wind c. natural gas d. water

The correct answer is C. Natural Gas is not a sustainable form of energy production.

Explanation:

Natural gas is a hydrocarbon mixture of light gases of natural origin. It mainly contains methane, and usually includes variable amounts of other alkanes, and sometimes a small percentage of carbon dioxide, nitrogen, hydrogen sulfide or helium. It is formed when several layers of decomposing plants and animal matter are exposed to intense heat and pressure under the surface of the Earth for millions of years. The energy that plants initially obtain from the sun is stored in the form of chemical bonds in the gas. It is an important source of fossil energy released by its combustion. It is extracted, either from independent deposits (non-associated gas), or next to oil or coal deposits (gas associated with other hydrocarbons and gases).

Due to the time it takes its generation and the small amount of available reserves, natural gas is considered a non-renewable energy source and, therefore, not sustainable over time.

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