1) Very few companies use CFC gases in aerosol cans nowadays .
2) People in my city take their bottles , cans , paper and plastic to recycling banks .
3) Some factories and most cars produce fumes that pollute the atmosphere.
4)The ozone layer above the southern hemisphere is already badly damaged.
5) Eco-tourism is environmentally-friendly tourism .
6) People are beginning to prefer wind and solar power to coal and oil .
7) One reason for this is that these energy sources maintain the air quality .
8) Some people go on working holidays where they spend their time planting trees .
