Investigating the planet's biomes and examining the modern threats to each ecosystem, this interactive series challenges young readers to look at how their own actions influence the planet's health. With compare-and-contrast facts and vocabulary-building sidebars, each engaging guide reveals how environmental threats--both human and natural--affect plants and animals. Evaluating the coldest biome, this resource examines how the living things found in the tundra coexist harmoniously with the harsh landscape. Explaining how environmental change threatens life in this biome, this instructive guide leaves readers with a greater understanding of the importance of conservation and preservation efforts.