Ex

Slide 28, Ex b
In 2007, politicians in Paris started a scheme to reduce pollution in the city.
People only have to pay if they use the bike for more than half an hour.
At more than 1,450 bicycle stations people can take bikes and leave them.
Some people still use cars to travel across the city.
Politicians think the Velib scheme might help to make the air in Paris cleaner.
If we don't change the situation, the problem of pollution will get bigger.