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President Reagan got hoots when he once claimed that trees cause air pollution, but intrepid University of Florida researchers have now confirmed that the Gipper was onto something. A new study of terpenes, a component of the gooey resin in pine tree sap, shows that at least some trees actually do contribute to pollution by reacting with other pollutants and sunlight to produce ozone. While this is not yet cause for alarm, they add, the situation could get worse as temperatures rise because of the "greenhouse effect."