Holes in the ozone layer, or general thinning of the ozone layer all over the world, occurs when ozone is being destroyed at a faster rate than it is being created by nature. Most of the damage that the ozone layer has sustained is caused by CFCs (chloro-fluoro-carbons). They can be found in mostly old spray cans, refrigerators, air conditioning systems, and fire extinguishers. The CFCs in those products enter the atmosphere and deplete the amount of ozone available for the ozone layer. This ultimately causes holes in the ozone layer and also causes the entire layer to thin.
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