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There are deserts all around the world. Deserts are getting bigger in some places. This is a (1) problem, since deserts can (2) farmland. Not only nature, but also people can cause deserts to (3). People can cause too much air pollution, which makes weather hofter. Large numbers of people can (4) land. Also, cutting down too many trees can make the soil lose water. People must (5) the land better if they want to stop desert growth.