"No doubt about it, water is pretty important! And all living things on Earth--from big blue whales to teeny-tiny bacteria--need water. But our world is currently facing some serious water problems: drinkable water isn't easily accessible to everyone, the demands for water around the globe are increasing but the supply is limited, and some human actions are causing disastrous ripple effects downstream for ecosystems and the animals that live in them. But there is hope: you! And that's where this book comes in. You'll discover what you can do right now to combat challenges to our environment."-- Page 4 of cover.