What can we learn about the health of an ecosystem through coral reefs? This title takes readers into our warming oceans to learn why and how coral reefs are hurting, and why its a larger issue for the thousands of animals and humans who depend on its resources.

"What can we learn about the health of an ecosystem through frogs? This title takes readers to our freshwater sources to see how pollution is disrupting the reproduction and lives of frogs, how humans are to blame, and what we can do to fix it"--Publisher's website.

What can we learn about the health of an ecosystem through polar bears? This title takes readers to polar bear habitats to understand why polar bears are suffering, what humans are doing to make matters worse, and the ways humans can help to ultimately save polar bears and Earth.