Bøger i Humans and Our Planet serien

"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"--

The hydrosphere encompasses all water on Earth from glaciers and ice to rivers and oceans. People use water every day. This title asks the question, how much do you use? Readers will learn how humans use water, how humans positively and negatively affect water and how to protect the water supply.