What is causing the significant increase in bee die-offs in the past decade? Recent research suggests there’s no single cause, instead pointing to several factors that combine or interact to weaken or kill bees. But according to an ongoing study in Stutsman County, N.D., at least one of those causes is tied to changes in the Dakota land where those bees buzz away their summers: The conversion of grassland to cropland is affecting bees’ diets, which makes them less healthy. Read More »