内容简介：
For too long, people have treated Earth's resources as if they will last forever. Now we are faced with serious challenges that threaten our planet's delicate balance. The series Improving Our Environment highlights important environmental issues and reminds readers that we must act now if we are to preserve our natural resources for ourselves and future generations. In addition to describing the causes and effects of problems around the globe, each title offers helpful suggestions for improving the environment and preventing further harm to our planer's fragile resources.