This Issue:

Table of Contents

Cover Story

Cover Story - Spanish Version

Mini-Lesson

Comprehension Quiz

Teacher's Guide and Worksheets

Welcome to the City of the Future

Spanish Translation

The past year was the hottest on record in the United States. Most scientists agree that people have played a big part in global warming. Everyday activities such as heating or cooling houses and schools, driving big cars and even using computers fill the air with a gas called carbon dioxide (die-ahk-side). That gas and a few others build up in the atmosphere. They trap the sun's heat near Earth's surface.

Wealthy countries like the U.S. create the most pollution. But scientists, lawmakers and others are looking for ways to fix the problem. As of April*12, mayors in 453 cities across the country had signed an agreement to reduce pollution. They are creating programs to encourage greener, or more Earth-friendly, living.

People are building healthier communities that use less energy. Here's what a town could look like in the near future if people start to put more energy into taking care of the environment.

The Green House

Energy-saving homes and buildings conserve, or save, water and energy. Grass- and plant-covered rooftops absorb less of the sun's heat, keeping things cooler. Open windows act as air conditioners. Some homes are built with recycled materials such as wood from old barns. In green schools, teachers use hands-on lessons to teach kids about the environment. Stores and offices are close enough to walk to.

Clean Power

Energy from the sun and wind can be used to help make things run. Solar panels turn the sun's energy into electricity. Wind turbines, often found on farms, turn wind power into electricity.

Green Machines

Cars can run on biofuels made from corn and grasses. Trains and other public transportation reduce the use of gasoline. Hybrid cars combine fuel-burning engines and battery-powered motors. Electric cars run on batteries that are charged the same way as laptop computer batteries.

Open Spaces

Backyards are used for composting. Food, paper and yard scraps break down quickly. This natural waste creates rich soil that is good for gardening. Recycling is as common as taking out the trash. Even land is recycled. Former airports and trash dumps are cleaned up and turned into parks.

Next: Celebrate Earth Day