In 1620, about half the USA was covered by forests. But today many forests have gone. China doesn’t want to copy the USA’s example. We are planting more and more trees. We have built the “Great Green Wall” of trees across northern part of our country. The Great Green Wall is 7,000 kilometers long, and between 400 and 1,700 kilometers wide. It will stop the wind from blowing earth away. More “Great Green Walls” are needed. Trees must be grown all over the world. The Great Green Walls will make the world better.
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