Everyone should do their best to preserve the environment. Trees range in size; the biggest is a type of sequoia. Exhaust fumes cause air pollution. Air pollution is getting worse every day. I can't do without a full breakfast. There are less fish in the Mediterranean nowadays due to overfishing. The city is noisier than the countryside. He has written a book drawing up his experience as an eco-warrior. Although deforestation is still a problem, it can be solved. Dodo birds are extinct animals.