If we ... the air, we .. serious health problems.
If people ... down trees, wild animals and plants ... .
If we ... around on foot, by bike or by boat, there ... so much air pollution.
If people ... rubbish into the oceans, they ... millions of fish.
If we ... old magazines and newspapers, we ... forests.
If people ... after picnics, there ... less litter.
If we ... nature, more species ... .
If we ... animals, we ... them chance to survive.
If you ... the tap while brushing your teeth, you ... too much water.
If you ... the light when you are not in the room, you ... save energy.
If we ... our car less, the air .... cleaner.
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