Where Have All the Bees Gone?: Pollinators in Crisis

Bees pollinate 75 percent of the fruits, vegetables, and nuts grown in the United States. Around the world, bees pollinate $24 billion worth of crops each year. Without bees, humans would face a drastically reduced diet. We need bees to grow the foods that keep us healthy.

But numbers of bees are falling, and that has scientists alarmed. What's causing the decline? D...