The question about the destruction of the ozone layer revolves around whether human-made CFCs (chlorofluorocarbons) used in air-conditioners and refrigerators are breaking it down. This is the ozone thinning theory: "CFCs release chlorine into the stratosphere... leading to ozone destruction and exposing the planet to harmful ultraviolet rays (Cagin 6)." Critics who discount the thinning theory still say that chlorine comes from natural sources like volcanic eruptions and does not cause permanent damage (Cagin 6). ... Scientists have now found that the, "Earth's protective ozone sh...

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