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. In "Oceans" kids will investigate this largest biome and see how environmental threats affect the earth's oceans. Changing climates threaten the plants and animals in the ocean's ecosystems as much as in the terrestrial biomes. Kids will learn about coral reefs, the rainforests of the ocean, and see the connection between increasing levels of carbon dioxide in the atmosphere and the bleaching of the reefs, which in turn affects every plant and animal in the ecosystem.