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I think kids should know that the Earth changes constantly. It's a very complex system, just like your own body. All of its parts are interacting all the time, and the system works amazingly well.
Unfortunately, sometimes people change the environment on the Earth in ways that could potentially hurt the system, and us, greatly. So we have to take care of the place where we live. For example, we can conserve the Earth's natural resources by recycling newspapers and not wasting water.
The Earth is the only planet we have. We have to protect it.
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