How Natural Gas Forms Activity Source: American Association of Petroleum Geologists. Adapted with permission from American Geosciences Institute in collaboration with Project SEED. Think about the energy you use every day to cook, cool your home, or travel. For most of us, the main sources of this energy are fossil fuels: coal, oil, and natural gas. Whether used directly, as gasoline, heating oil, or natural gas, or to generate electricity (by burning coal), fossil fuels are a big part of the world’s energy picture. [Read More]