In 2017, Wang Dayong flew a drone (无人机) over a mountain in Yunnan. He saw the land looked barren(荒芜的) because it had been used too much.
Long ago, people said the area grew great coffee. Wang wanted to make things better. So he planted lots of trees and new coffee plants. He made sure to avoid using harmful chemicals.
Soon, the land turned green again. The local farmers started growing high-quality coffee. They earned more money too. Now, the mountain is healthy and full of vitality(生命力) again.
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