With the development of economy, more and more factories have been set up. More and more trees have been cut down so that more and more buildings can be built, because more and more babies are born. Many people don't pay attention to the environment, so the earth is getting warmer and warmer. As a result, the ice is always melting, even at the North Pole. So if it goes on like that, many cities along the coast will be covered by water. Many people will lose their homes. In order to stop this happening, we should stop cutting down trees, polluting rivers and lakes. Factoreis should make the smoke or water cleaned before pouring our into the sky or rivers and lakes. Then we, even our next generation can live a happy life.
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