Every living thing on our planet needs air to survive. Most of the time, we hardly even think about Earth's air. But did you know that many of the things we use every day—from cars to electricity—hurt the quality of our air? The pollution in the air can make people, plants, and animals sick. We must join together in the quest to improve Earth's air quality. With engaging text and eye-catching images—plus a special Going Green section—this book tells you all about Earth's air and what you can do to protect it.