what is nature? its everything that exists in the world independently of people, such as pants and animals, earth and rocks, and the weather.now more and more people are focusing on the nature.

　　it is no doubt that the nature is important to every human being.

　　no nature, no life.

　　because of the supplies of the nature, we have lived happily for a long time.

　　and we started to gain every thing available from the nature.

　　and this lasted so long a time.

　　today, people have discovered that the nature around is getting worse and worse.what is threatening the nature? air and water pollution, over harvesting of plant and animal species, overpopulation and so on.

　　overpopulation is the biggest source of pollution.

　　lets take overpopulation as an example.what does overpopulation feel like? when we move slowly through the city in a taxi.

　　when we enter a crowded slum district.

　　when the temperature is high and when the air is thick with dust and smoke.

　　the streets are crowded with people.

　　the streets seem alive with people.

　　people eating.

　　people washing.

　　people talking.

　　people sleeping.

　　people visiting each other, arguing and screaming.

　　people relieving themselves.

　　people pushing their hands through the taxi windows, begging.

　　people leading animals.

　　people, people, people, people.

　　as we drive slowly through the crowd, sounding the taxis horn, the dust, heat, noise and cooking fires made it like a scene from hell! i admit, frightening.to the nature, overpopulation is a big problem.

　　more people, more pollution.

　　and the big population is threatening the nature every second.the rapid rise in world population is not creating problems only for the developing countries.

　　the whole world faces the problem that raw materials are being used up at an increasing rate and food production can not keep up with the population increase.

　　people in rich countries make the heaviest demands on the worlds resources, its food, fuel and land, and cause the most pollution.

　　a baby born in the united states will use in his lifetime 30 times more of the worlds resources than a baby born in india.

　　unless all the countries of the world take united action to deal with the population explosion there will be more and more people fighting for a share of less and less land, food and fuel, and the future will bring poverty, misery and war to us all.for most of the developing countries, it is a good idea to control the population growth.

什么是自然？它的一切存在于独立于人的世界，如植物和动物，地球和岩石，和weather.now越来越多的人关注自然。毫无疑问，自然对每个人都很重要。没有自然，没有生命。由于大自然的供应，我们幸福地生活了很长一段时间。我们开始从大自然中获得一切可得的东西。这持续了这么长的时间。今天，人们已经发现，周围的自然情况是日薄西山的本质？空气和水的污染，过度采集的植物和动物物种，人口过剩等。人口过剩是的污染源。就拿人口过剩为例的感觉吗？当我们在一辆出租车里慢慢地穿过城市。当我们进入拥挤的贫民区。当温度很高，空气很厚时，灰尘和烟雾。街上挤满了人。街上似乎还活着的人。吃人。人们洗涤。人们说话。人们睡觉。人们互相拜访，争论和尖叫。人们救济自己。人们用手推着出租车的窗户，乞讨。人畜。人，人，人，人。当我们慢慢地穿过人群，鸣着出租车的号角，灰尘，热，噪音和烹饪火灾使它像一个场景从地狱！我承认，frightening.to性质，人口过剩是一个大问题。更多的人，更多的污染。和大人口威胁的性质每上生齿迅速增长不仅为发展中国家创造问题。整个世界都面临着越来越大的增长率和粮食生产无法跟上人口增长的问题。发达国家的人民对世界资源、粮食、燃料和土地的需求量，造成的污染最严重。一个出生在美国的婴儿将在他的一生中使用30倍以上的世界资源比一个婴儿出生在印度。除非世界各国采取联合行动来应对人口爆炸将有越来越多的人分享越来越少的土地而战，食物和燃料，以及未来将带来的贫困，苦难和战争给我们的所有。大多数发展中国家，这是一个好主意，控制人口的增长。