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In this Aug. 22, 2017 file photo a bee sits on a cornflower to collect pollen in Frankfurt, Germany. Scientists say an "alarming" drop in the number of flying insects in Germany could have serious consequences for ecosystems and food chains. In a paper published Wednesday Oct. 18, 2017 by the journal PLOS ONE, the scientists said the drop in airborne insects over Germany was higher than the global estimated insect decline of 58 percent between 1970 and 2012. (AP Photo/Michael Probst,file)

In this Aug. 22, 2017 file photo a bee sits on a cornflower to collect pollen in Frankfurt, Germany. Scientists say an "alarming" drop in the number of flying insects in Germany could have serious consequences for ecosystems and food chains. In a paper published Wednesday Oct. 18, 2017 by the journal PLOS ONE, the scientists said the drop in airborne insects over Germany was higher than the global estimated insect decline of 58 percent between 1970 and 2012. (AP Photo/Michael Probst,file)

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