On the Santa Monica freeway, in Los Angeles, thousand of people are trying to work, but they are going nowhere. A driver in Los Angeles spends about 70 hours a year in traffic that is not moving. where 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 off all the pollution in the air! It is the same every morning in Sao Paulo, Moscow,Bangkok, and many other cities.