First Conditional
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 you ... the light when you are not in the room, you ... save energy.
If you ... the tap while brushing your teeth, you ... too much water.
If we ... animals, we ... them chance to survive.
If we ... nature, more species ... .
If people ... things, there ... less rubbish.
If people ... after picnics, there ... less litter.
If we ... old magazines and newspapers, we ... forests.
If people .... their knowledge on ecology on practice, they ... our planet.
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