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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