10 What next

Chapter 10 What next? Today, there are more cars on the roads than ever. They use up lots of fuel and puff horrible fumes into the air.

Now, engineers are inventing cars that won't pollute the air. They might run on energy from the sun... ...or give off water instead of nasty fumes.

Tomorrow's cars will be all kinds of astonishing shapes. Some of them may even fly. Byeeee!