Global guardians

An introduction to invasive species that explains how they appear in an area, how humans play a role in spreading and controlling them, and the problems they can cause for plants and animals that are native to a habitat.

"Introduces the importance of recycling and conserving, ... the different methods people use to recycle and conserve resources, and the impact these efforts have on Earth"--Provided by publisher.

Introduces fossil fuels and alternative sources of energy including wind, solar, and hydroelectric power.

"People and animals have shared the planet for thousands of years, but unfortunately, human behavior can seriously threaten species survival. This title examines this important concept, giving readers a close-up look at the animal species that are currently classified as endangered." Readers will learn about animals habitats and behavior how those things are affected by human activity."--Amazon.com.