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404 bytes added ,  23:29, September 25, 2007
controversy theory, darling of enviormentalists
The '''ozone depletion''' theory states that emissions of [[freon]] from air conditioners and spray cans have (1) depleted the sky's [[ozone layer]] which (2) caused more harmful [[ultraviolet]] sunlight to reach the Earth's surface which in turn (3) increased the incidence of deadly human [[skin cancer]].

This theory is controversial, but politicians worldwide accepted it; see [[Montreal Protocol]].
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