A driver in Los Angeles spends about 70 hours a year in traffic that is not moving. While long lines of cars wait under the hot Californian sun, their engines are producing dangerous gases Drivers look angrily at their watches. Sometimes, you cannot see the sun in Los Angeles because of all the pollution in the air! It is the same every morning in Sao Paulo, Moscow, Bangkok, and many other cities. What about other ways to travel? Walking and cycling to work or school are great ways to save energy and stay healthy as well. If you cannot cycle or walk somewhere, you can still save energy if you take a train or bus instead of driving. In a lot of cities, people are joining car-sharing groups; each person in the group drives their friends to work one day a week. Everyone saves petrol and money, and there are fewer cars on the road.