Do you know? (O. Karpyuk p. 161)

Forests cover ... % of the Earth’s land.

Every person produces about 650 tons of ... during his/ her lifetime.

One of the solutions to get rid of rubbish is ...

One ton of recycled paper can save ... trees

... produce oxygen.

Today, oceans and seas have become very ...

It isn't important to recycle old paper.

Forests are not terribly important for us.

Ocean and sea life are in danger.

Oil spills are a great source of pollution.

A few species are in danger of becoming extinct.

We still have enough space for garbage.