fossil fuel

noun Energy.
any combustible organic material, as oil, coal, or natural gas, derived from the remains of former life.
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Collins
World English Dictionary
fossil fuel
 
n
any naturally occurring carbon or hydrocarbon fuel, such as coal, petroleum, peat, and natural gas, formed by the decomposition of prehistoric organisms

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Fossil fuel is always a great word to know.
So is gobo. Does it mean:
a scrap or morsel of food left at a meal.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
American Heritage
Science Dictionary
fossil fuel  
A hydrocarbon deposit, such as petroleum, coal, or natural gas, derived from the accumulated remains of ancient plants and animals and used as fuel. carbon dioxide and other greenhouse gases generated by burning fossil fuels are considered to be one of the principal causes of global warming.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
We need to promote research into non-fossil fuel alternatives.
The extraction of the fossil fuel should had already gotten rid of all those
  poor skinny people.
We are on the clock with impending fossil fuel depletion and climate change.
The burning of coal to generate electricity is a relative newcomer in the long
  history of this fossil fuel.
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