I think "the earth"is a best for new topic.Now,we have a variety of problems for living on the earth.For example,there is a problem of global warming,a lack of natural resources or food,the destruction of the ozone layer by a chlorofluorocarbon and so on.We must solve these problems surely for the future of the earth and we must do whatever little things we can.
So let's talk about the earth.
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