Today,there are more and more people on earth. Earth is becoming more and more crowded, pollution has became more and more serious. Wildlife animals lost their lives, more and more animals are nearly disappear.If we do not take measures, human will not be able to live on the earth: then, we have no choice but have to move to other planets;
We can not imagine how the earth will be in 100 years.So I think we must protect the enviroment and reduce the pollution now, because we only have one earth.（我认为我们必须保护环境,减少污染,因为我们只有一个地球）
Daniel