We compaign against air and water ____________.
We compaign for waste ___________ so that glass, paper and aluminium can be used again.
All the fish in the river have died because of the ____________ waste from factories nearby.
In 25 years people _______________ (not / cut down) the rainforests. Rainforests ______________(not / exist).
Smog is an example of ________ _________.
Which of these things is good for the environment?
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