People need to breathe. If we don't breathe, we will die. But how clean is the air people breathe? If they breathe (1)............air, they will have breathing problems and become ill. Plants and animals need (2)..........air too. A lot of the things (3)...........our lives create harmful gases and make the air dirty, like cars, motorbikes and factories. Dirty air is called "polluted air". Air pollution can also (4)...........our Earth warmer. The problem of air pollution started with the...
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People need to breathe. If we don't breathe, we will die. But how clean is the air people breathe? If they breathe (1)............air, they will have breathing problems and become ill. Plants and animals need (2)..........air too. A lot of the things (3)...........our lives create harmful gases and make the air dirty, like cars, motorbikes and factories. Dirty air is called "polluted air". Air pollution can also (4)...........our Earth warmer. The problem of air pollution started with the burning of coal homes (5).............factories.
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clean air
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