It’s just a tiny insect, but the humble honeybee has a huge impact on our way of life. Aside from providing honey, honeybees are responsible for pollinating a majority of the crops consumed in the United States and around the world, from blueberry patches in Maine to almond groves in California. But honeybees are facing both natural and manmade threats that are killing them by the millions. A major result of these threats — colony collapse disorder — is already being felt in the beekeeping industry, which has reported astounding losses in recent years. Robbie Shell, who previously was the editorial director at Knowledge at Wharton, has written a book for middle grade kids titled Bees on the Roof that calls attention to the scope of these problems. Her book is part of a recent trend in publishing called “environmental fiction,” which combines a fictional story with factual information to help readers gain a better understanding of an issue related to our environment.…