The concern stems from the fact that one-third of the food consumed by humans comes from flowering plants, 80 % of which depend on bees for pollination. A single worker bee can alight on 5,000 blossoms a day and transfer pollen between tens of thousands of stamens and pistils.
原因是人類食物有三分之一來自開花植物，其中 8 成靠蜜蜂授粉，一隻工蜂一天可以飛過 5,000 朵花，沾黏數萬蕊花粉。