Используя Conditional II или III

if we (throw away) less rubbish our planet would be cleaner/

if i...(be) you, i would join greenpeace

if you had read these books you (know) more about enviromental problems.

if people (avoid) damaging nature many species of animals wouldnt have disappeared

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If we threw away less rubbish our planet would be cleaner.
If i was you, i would join greenpeace.
If you had read these books you would have known more about environmental problems.
If people had avoid damaging nature many species of animals wouldnt have disappeared.

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