The world population is growing in many parts of the world, but in some European countries families are becoming smaller.
In the future people will need more food, water, houses and energy.
Our climate is changing and getting
People are not responsible for climate changes.
Earth's climate has never changed before.
The Arctic ice is melting because of
People can live without water.
It is a problem for some people to get clean water.
Our world is polluted because people throw rubbish everywhere.
There are many endangered animal species because people destroy the places where they live.
We should cut down trees to protect forests and jungles.
It is difficult for polar bears to hunt because more and more ice disappears.
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