The earth is 4.5 billion years old. At first it was a dead object of rock, without air or water, now the earth is home to a variety of living things. All the varieties of plants and animals are dependent on the sun, on air and water, and on each other. The sun will shine for millions of years into the future. But will we be able to keep the earth a special place among the planets? The future of the earth doesnt look bright. By the year 2000 there will be over six billion people on our planet. In twenty years bad air will produce more serious health problems. If we cut down too many trees, many birds and wild animals wont have a home. We will destroy our environment if we dont plan for the future.
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