The Earth is 4,600 million years old. Modern man has lived on the Earth
for only 35,000 years but, in that time, we have changed our planet in many
ways. Many of the things we have done are good, but many, many more are
not good for the Earth.
In the last 40 years, the population of the world has doubled. By the year
2200, it will probably be 10,000 million. This means that we must change
the way we use energy and natural resources. We must also look after the environment.

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