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Conventional Fossil Fuel Resources
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"Although there are different forms of energy, about 88% of the energy consumed by humans comes from the burning of coal, oil, and natural gas, fuels that are collectively referred to as fossil fuels as they are derived from remains of ancient plants and animals. In recent years the world has discovered that its demand for energy is outstripping the supply of inexpensive oil and gas, creating price instabilities that threaten to cripple the global economy. Equally troubling is the fact that our massive use of fossil fuels is contributing to the growing problem of global warming."

From: Environmental Geology
by James S. Reichard