Since their appearance on Earth, humans and their ancestors have impacted their surroundings. However, they've affected some of these environments more severely than others. Readers will learn how human activities, such as burning fossil fuels and hunting, have directly and indirectly impacted tundra environments for thousands of years. Fact boxes and sidebars provide readers with supplementary information about the subject matter, while full-color photographs show the damaging effects of human activities on tundra environments.