Acid rain started to fall, which killed the trees.Acid rain: An unusually acidic rain, which damages forests, lakes, and also buildings.Then, many people stood up to protect the forest. I also wanted to do something for nature, and that is why I became a biologist.Currently, we reduce the number of trees cut down, and plant many kinds of trees.German people are working hard to keep the forest rich forever. There are professional foresters who care for the forest.Sometimes, human intervention can restorea rich natural environment.
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