Like many countries, Britain has serious environmental problems. In 1952, more than 4,000 people died in London because of the smog. The government introduced new laws to stop smog from coal fires and factories and the situation improved a lot.

Today, London is much cleaner but there is a new problem: smog from cars. In December 1991, there was very little wind in London and pollution increased. As a result, about 160 people died from pollution in just four days.

Part of the problem is the new "out of town" shopping centres. In the past, people often walked to shops near their homes or went by bus. Now, many people drive to the new shopping centres. The small shops have disappeared and more people have to travel to do their shopping.

Many people are trying to reduce the use of cars in Britain. Some cities now have special bicycle lanes, so people cycle to work. Some people also travel to work together in one car to reduce pollution and costs.