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Birds are nature's essential workers, and they are crucial members of ecosystems around the world. Hummingbirds pollinate our flowers; cardinals munch on beetles, grasshoppers, and other pests that damage crops; owls eat rodents that can spread disease; vultures clean up roadkill and other waste. Beyond their practical aspects, birds bring us joy through their songs and beautiful feathers. But since 1970, nearly 30 percent of all birds in the United States and Canada have vanished. Scientists ar

Wildfires are a natural process that take place in forests and grasslands all over the world. In dry conditions, a single spark can rapidly transform into flames that stretch for miles and sweep across the landscape, burning away everything in their path. Although commonly seen as destructive and deadly, fire is a necessary part of ecosystems; they refresh the land and allow for new plant growth. Environmental scientist Ferin Anderson and author Stephanie Sammartino McPherson examine how Indigen

Depression is a mood disorder that causes long-term feelings of sadness and worthlessness that interfere with daily functioning. More than 20 percent of adolescents have experienced depression while they were teenagers. With the help of facts and quotations as well as anecdotes about teens who have experienced depression, this book aims to explain what depression is, how it affects teens, how it is diagnosed, and how it is treated.