If you’ve ever seen smog hanging low over a city, then you’ve seen air pollution first-hand. Air pollution can be natural or man-made, but it’s the man-made pollutants that are the most destructive, like greenhouse gases that contribute to global warming and the destruction of the ozone. Carbon dioxide is one of the worst air pollutants, it’s mainly emitted from power plants, cars, planes and other vehicles and comes from burning fossil fuels. Another major air pollutant is methane, which comes from raising livestock, and CFCs (chlorofluorocarbons) which are used in aerosol products.
Air pollution has been linked to health problems like asthma and lung disease, as well as the deterioration of the ozone layer (which protects us from harmful UV rays) and the warming of the earth which may destroy the habitats of many animals. Governments are trying to encourage people to lessen air pollution driving less, recycling and limiting their energy consumption.
If you’ve ever seen smog hanging low over a city, then you’ve seen air pollution first-hand. Air pollution can be natural or man-made, but it’s the man-made pollutants that are the most destructive, like greenhouse gases that contribute to global warming and the destruction of the ozone. Carbon dioxide is one of the worst air pollutants, it’s mainly emitted from power plants, cars, planes and other vehicles and comes from burning fossil fuels. Another major air pollutant is methane, which comes from raising livestock, and CFCs (chlorofluorocarbons) which are used in aerosol products.
Air pollution has been linked to health problems like asthma and lung disease, as well as the deterioration of the ozone layer (which protects us from harmful UV rays) and the warming of the earth which may destroy the habitats of many animals. Governments are trying to encourage people to lessen air pollution driving less, recycling and limiting their energy consumption.
I
1. She was singing a song while she was going to the meeting.
2. He was trying to open the door when we saw him in the corridor.
II
1. "Is George going to eat dinner with us?"- "No, by the time he gets home it will be very late.
2. I shall/will pay the rent, when you get our pay cheque.
III
1. Look! That man has blue hair!
2. I can't hear them. What are they talking about?
IV
1. "I don't like wearing a suit every day". -"Don't worry, you will get used to it very soon.
2. Do you remember the things we used to do when we were kids?" - "Of course I do. How could I forget what fun we had!”
3. The manager informed us that we would receive all the documents in time.
4. She feels that something will happen.