Natural gas is a fossil fuel formed underground over millions of years from the remains of plants, animals and microorganisms. Like all fossil fuels, it is “non renewable”—there is a finite amount of it, and once it is depleted, there is no more available for future needs. Non-renewable resources are consumed much faster than nature can create them.
Natural gas is generally found a mile or more beneath the earth’s surface, but is sometimes found at shallower depths.