1
condition causing global warming
2
rubbish disposed by factories
3
gases emitted from the rear part of cars, buses, etc.
4
chemicals used by farmers to make plants grow bigger
5
petrol, coal, etc.
6
gas that protects the living organisms from the harmful rays of the sun
7
area where rubbish is disposed
8
sprays
9
system of pipes carrying away liquid waste from houses, roads, etc.
10
aluminum containers for refreshments, beer, etc.
11
air pollution in cities caused by toxic chemicals in the air
12
plastic or metal container for rubbish disposal
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