Over 100 scientists worldwide, citing 800 studies, are demanding that the Obama administration follow Europe’s lead and put a moratorium on the use of a new-style pesticide blamed for the deaths of 30 percent of American honeybees every year. In a letter to the EPA and Agriculture Department, the scientists said there is overwhelming evidence from 800 studies that the pesticide family called neonicotinoids are to blame for the substantial declines in honeybees, bumblebees and butterflies, all pollinators needed to help farmers produce billions of dollars worth of food every year. “The 108 signers of this letter therefore urge you...