【正确答案】[范文] There goes a famous remark that 'Earth provides enough to satisfy every man's need, but not every man's greed.' Simple as it might sound, its intended meaning is profound and thought-provoking. The remark implicitly tells us that human being's inexhaustible desire has made it hard for the Earth to provide abundant natural resources to satisfy everyone. In other words, these resources would be exhausted one day if we don't refrain from asking more than we need. A case in point is the global petroleum which is excessively exploited due to human's unlimited desire for rapid industrial development. It is estimated that according to human being's present consumption, the petroleum can maintain no more than 50 years. Another example is the dwindling Amazon rainforest where many species are endangered because of deforestation. In short, greed is hard to satisfy. We should keep in mind that neither a person nor a nation should use the natural resources excessively and endlessly. Great efforts should be made to effectively protect, rationally exploit and economize natural resources.