我不说空气污染，水质污染或者石油短缺这些东西。有时候我们应该冷静仔细观察下周围的事情，就算不能解决我们知道的问题，但能解决我们可以解决的问题。我是北京的，我生在这儿，我觉得这最大的环境问题是吐痰。

　　Beijing, actually, China is developing super fast in recent years. But a world of people restored their bad habit and they spit everywhere. As u can see, now and then, whether in the street, on the bus, or in city gardens, we will see some people, sorry, many people Im afraid, the fine ladies, gentlemen and even kids spitting without feeling a bit ashamed. They just turn a blind eye to where the NO SPITTING shown.

　　北京，确切说是整个中国在飞速发展。但是还有很多人保留了他们的坏习惯，随地吐痰。就像你看到的，不管是在大街上，公车上，公园里，我们总能看到一些人，不，恐怕是很多人： 男人、女人、甚至还有小孩面无羞涩的随地吐痰。他们对禁止随地吐痰的警示视而不见。

　　what the causes of the problem are

　　I dont know what they were thing about but know what they think about: They feel released and have freedom in fresh open air and they think the earth is a gigantic spittoon.

　　我不知道这些人当时在想什么，但我知道他们怎么想的。他们觉得在空气新鲜的户外得到了更多的释放和自由，觉得地球和一个大痰盂没任何区别。

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