____ – A normal phenomenon of ____ temperatures worldwide, but human activities (use of fossil fuels) that produce greenhouse gases are currently ____ the amount and rate of global warming at an unnatural rate Fossil Fuels – Types of fuel that were formed in the earth long ago from ____ and ____ materials. Examples are ____, ____, and ____ Greenhouse Gases – Gases like carbon ____, ____, and nitrous ____ that remain in the earth’s atmosphere, causing a warming effect on the earth’s surface Ethanol – A biofuel produced from corn or sugar cane that is cleaner-burning than regular gasoline ____ Energy – A renewable energy source that uses the energy from the sun to ____ electricity ____ Energy – A ____ energy source that uses the ____ of the wind – often using wind ____ with propellers – to generate electricity ____ Energy – A renewable energy source that uses the ____ from within the earth to produce ____ and hot water to use as ____ ____ Energy – A renewable energy source that comes from ____ or ____ materials, including waste and ____ ____ Energy – A renewable energy that uses the ____ of water to generate electricity

renewable energy resources

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