FILE - In this March 5, 2004 file photo, a man walks along a path lined with elm trees in Princeton, N.J.. The recent spring-like weather has a big downside for allergy sufferers: Tree buds, the first being elms and maples, have begun releasing pollen ahead of the normal time. A report issued Monday, April 4, 2016, by the Obama Administration listed how global warming will make the air dirtier, water more contaminated and food more tainted. It warned of diseases, such as those spread by ticks and mosquitoes, longer allergy seasons, and thousands of heat wave deaths. (AP Photo/Daniel Hulshizer, File)
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