We have only one earth .But now , because of world economy developed at full speed ,there is century problem------- environmental problem . The Earth , the only home of human beings , we have to take good care of her . As you know , there is no enough clean water for people . So many of them lose their lives because of water . In many countries ,people have to cut trees for living . So there is nothing to keep water from running away .Also we have polluted the land ,the river and the air .So we have to face more and more floods and droughts. It is the time to do some useful to protect our earth .We can plant trees and take good care of them . we can save water and ask other people around me to do so . We can not throw any little onto the ground and we should collect them for recycling .We have the same sky , the same earth . The common fate link with us tightly . We are in duty bound to protect the earth .
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