5 Use the words in their correct form to complete the gaps. • replace • congestion • campaign • encourage • energy • ban • switch • emissions For many years the traffic in our town has been getting busier and busier. It has become a huge environmental problem because of all the carbon 1)........... produced by the vehicles. One group of environmentalists have started a 2) to do something about it. They want to 3)........... certain vehicles from the roads during times of high 4)........... and 5)........... people to use public transport. They want people to understand that by 6) from a form of transport that uses a Iot of 7) and 8) it with one that uses less, they will be doing their part to help save the planet.