Fossil fuels are fuels formed from dead organic matter that has decomposed over millions of years. Oil, coal and natural gas are examples of fossil fuels. Human activities such as industrial, transportation, domestic and commercial activities require large amount of energy; fossil fuels are burnt to produce large amount of energy essential for human activities.
Fossil fuels contain high content of carbon and by burning it, it releases large amount of carbon dioxide, a greenhouse gas. The burning of fossil fuels produces the most amount of greenhouse gases. The burning of fossil fuels releases billions of tonnes of carbon dioxide into the atmosphere annually.
The world's usage of fossil fuels has increased in recent years.
In 2010, the global carbon dioxide emission is 30.6 billion tonne, 1.62 billion tonnes more than the carbon dioxide emission in 2009.
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