1)In our country there is a list of environmental issues which a grave in deed. The most serious in my city is air and land pollution.
2)There are a lot of Youth organizations for the protection of nature, so, I think that teenagers can join these groups and start to make their own cities cleaner.
3)I prefer to live in the big city, even if it's dirty, because in a big city I have more oppotunities to make my future career.