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Humans have invented many ways to use energy from natural resources. Some of these uses of energy add to air pollution, and others do not.

Below are three examples of using energy from natural resources. Select the use of energy that did not add to air pollution.

Hint: Burning a material such as wood, oil, or coal releases chemicals that add to air pollution.

Wood burned in a fire, cooking vegetables.

Wind moved a sailboat across the water.

A candle burned paraffin, a wax made from petroleum oil.

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