Includes bibliographical references (page 31) and index.
Contents:
Have humans impacted Earth? -- Human impacts -- Nonrenewable resources -- Alternative energy resources -- How can humans help?
Summary:
Pollution and mining for resources have negatively impacted Earth. Nonrenewable resources will someday run out. Then what? In this title readers will learn about alternative energy sources such as solar, wind, and geothermal energy, and what they can do to positively affect Earth. Meets Next Generation Science Standards.
This resource is supported by the Institute of Museum and Library Services under the provisions of the Library Services and Technology Act as administered by State Library of Iowa.