what is nature由刀豆文库小编整理，希望给你工作、学习、生活带来方便，猜你可能喜欢“whatisnature教案”。
honorable judges, ladies and gentlemen.Good afternoon, 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.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.unle 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 le and le 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..as we all know, the challenge and opportunity always, confused with hope, in the 21st century, is also twin human facing challenges period.special performance in this aspect of the relation between man and nature.human deforestation, blind development farming, damaging the vegetation, causes soil erosion, desertification, any natural resources, make the underground mining mineral deposits in the increasingly exhausted, wastewater and waste, exhaust gas emiion, make continuous natural environment seriously deteriorating.human nature is exceive to take, suffer the nature ruthleretaliation: hurricane, rainstorm, storms, floods and drought, insect, heat, forest fires, earthquake, etc.we only have one world as is known to all , we have a beautiful world.we can see the sun shining.we can see the moon in a full view.we can see the birds flying in the sky.we can see the horses running on the plain.however, the world is not as beautiul as before, for human beings have brought a disaster to the world.
