There are many reasons for global warming, which can be summarized as follows:

1. Population explosion factor

The rapid population growth in recent years is one of the main factors leading to global warming. At the same time, it also seriously threatens the balance between the natural ecological environment. With such a huge population, the annual carbon dioxide emitted by itself will be an amazing number, and the result will directly lead to the continuous increase of carbon dioxide content in the atmosphere, thus directly affecting the climate change on the earth's surface.

2. Atmospheric environmental pollution factors

At present, the increasingly serious environmental pollution has become a major global problem, and it is also one of the main factors leading to global warming. Now, the research on global climate change has clearly pointed out that the temperature of the earth's surface has started to rise since the end of last century.

3. Deteriorating factors of marine ecological environment

At present, the change of sea level is on the rise. According to the prediction of relevant experts, the sea level may rise by 50 cm by the middle of the next century. If no measures are taken, it will directly lead to the destruction and pollution of fresh water resources and other adverse consequences. In addition, a large number of toxic chemical wastes and solid wastes produced by land activities are continuously discharged into the sea; Major oil spills in seawater and the destruction of coastal ecological environment by human activities are the main factors leading to the destruction of seawater ecological environment.

4. Land erosion, desertification and other destructive factors

5. Factors of sharp decline of forest resources

Worldwide, due to natural or man-made factors, the forest area is decreasing sharply.

6. Hazard factors of acid rain

The influence of acid rain on ecological environment has attracted more and more attention all over the world. Acid rain will destroy forests, acidify lakes and endanger living things. At present, most of the acid rain in the world is concentrated in Europe and North America, and most of them occur in developed countries and some developing countries. Acid rain is also occurring and developing rapidly.

7. Factors accelerating species extinction

Life on the earth is a precious resource for human beings, and the diversity of life is the basis for human survival and development. But at present, the biological species on the earth are disappearing at an unprecedented rate.

8. Water pollution factors

According to the water quality monitoring project of Global Environmental Monitoring System, about 65,438+00% of the monitored rivers in the world are polluted. Since the beginning of this century, the water consumption of human beings is increasing rapidly, and the scale of water pollution is also expanding, forming a contradiction between supply and demand of fresh water. Therefore, the treatment of water pollution will be very urgent and important.

9. Toxic waste pollution factors

More and more toxic chemicals not only pose a serious threat to human survival, but also do harm to the ecological environment on the earth's surface.

10 Changes of the Earth's Periodic Orbit

The earth's periodic orbit changes from ellipse to circle, which is closer to the sun. According to a scientist's research, the temperature of the earth has been alternating between high temperature and low temperature, with certain regularity.

The harm is

Global warming will reduce global agricultural production. The reasons are as follows: global warming will prolong the growth period of crops in colder high latitudes and increase the yield accordingly. However, rising temperature will also increase extreme weather in mid-latitude areas, increase surface evaporation, lower groundwater level and aggravate drought. Rising temperature will aggravate high temperature and summer drought in low latitudes. All these will lead to a decline in grain production in the middle and low latitudes. The main grain producing areas in the world are all distributed in the middle and low latitudes, and the cultivated land area in the high latitudes is limited, so the increased grain output in the high latitudes is far from making up for the reduced grain output in other regions.

Global warming, South Pacific island countries are about to reach the summit. Global warming leads to the rapid melting of Antarctic and Arctic ice sheets and rising sea levels. According to a report of the World Bank, even a slight sea level rise of 1 m is enough to cause 56 million people in developing countries to become refugees. The world's first inhabited island submerged by seawater is about to be born-Katri Island, located in Papua New Guinea, a South Pacific country. Now the main roads on the island are waist deep, and all agricultural land has turned into mud.

Malaria is rampant in farmland. People in Catalina Island, dressed in traditional costumes, have always been happy in their life of knowing and doing, have been independent for hundreds of years, and have always maintained a traditional lifestyle. However, due to global warming caused by human destruction of the environment, they are facing the fate of being submerged by seawater. Paul Tabashi, an environmentalist on Katrina Island, said: "They have been attacked by ocean forces and floods have been going on. The original area has been changed and destroyed, and almost all places have been submerged by seawater. Now the original main road on the island is waist-deep, and all the farmland where coconut trees were planted has turned into mud. To make matters worse, mosquitoes and flies swarm and malaria is rampant. Experts predict that in a few years, Katri Island will be completely submerged in seawater, and it is imperative for the residents of the whole island to move to villages and evacuate.

Amazon's Amazon rainforest is gradually disappearing. The Amazon rainforest, the largest tropical rain forest in South America and even the world, is gradually disappearing, making the global warming crisis worse. The Amazon rainforest, known as the lung of the earth, covers 5% of the earth's surface and produces 20% of oxygen and 30% of biological species in the world. Due to illegal logging and reclamation, the Amazon rainforest is disappearing at an area of 7,700 square miles per year, equivalent to the area of New Jersey. The disappearance of the rainforest will not only aggravate global warming, but also make many creatures that can only live in the rainforest face the crisis of extinction. In the past 40 years,

About Beijing's environmental problems

The reason why it doesn't snow in Beijing this year is that snowfall is determined by several factors. Besides cold air heading south, water vapor is also needed. From the perspective of Beijing, water vapor mainly comes from two channels. One is that the water vapor brought by the warm and humid airflow in the southwest of Jiangnan, especially snowfall, often has the characteristics of large snowfall and long snowfall time, which often becomes the main factor of snowfall in Beijing; Another source of water vapor is the water vapor brought by the easterly airflow in Bohai Sea and Yellow Sea. However, due to the short conveying length, its snowfall is characterized by less snow. The southwest warm and humid air flow mainly comes from the Bay of Bengal, and there are some anomalies in the atmospheric circulation this winter, which makes it difficult to transport the water vapor from the Bay of Bengal to Chinese mainland. In addition, the continental monsoon controls Beijing in winter. The continental monsoon is relatively dry and the water content in the air is low. The cold air that affects China this winter is more frequent, and the path is east-north direction. Except the northeast, the airflow in most parts of China is dominated by the northwest, that is, the atmospheric circulation prevails in the mid-latitude area, and it is not easy for the northwest airflow to form rain and snow in the downward flow.

Historically, there has been little precipitation in winter in Beijing. The precipitation from 65438+February to the following February is usually around 10 mm, so it cannot be said that there is no precipitation in winter. Looking back, the last winter with almost no precipitation was 1970. However, since 2008124 October 65438, there has been no precipitation in the urban area this winter, which is really rare. From 65438+February last year to now, four cold waves have swept through the city, but all of them are mainly cooled by strong winds. The northwest wind prevailed in Beijing this winter, which is not conducive to the transportation of these two streams of water vapor. However, the easterly wind or southwest wind occasionally formed through the change of atmospheric circulation has basically not formed this year, so the water vapor transportation has basically been broken.

At present, most climatologists believe that global warming will lead to an increase in extreme weather. With global warming, the frequency of extreme weather is increasing, but how global warming affects the appearance of extreme weather and what is the inevitable relationship between them is still an unsolved mystery.

As for sandstorms, if the drought continues, the precipitation is unusually low, and the soil moisture is rapidly lost, it is likely that the number of spring sandstorms in northern China will increase accordingly after the spring, and Beijing is no exception. Moreover, the temperature in the north is high and the air pressure is low. Once the strong cold air strikes, the horizontal pressure gradient force increases, resulting in windy weather, which is more likely to lead to dusty weather.

In addition, according to folk proverbs such as "it's cold and it doesn't snow, but it's hot and the fields crack", there may be drought in Beijing this summer, but now the global climate is abnormal, so it's hard to say what it is.

Global warming has changed the earth in many ways, and some changes themselves will also inhibit the global warming trend.

First, global warming makes some ice and snow on the earth melt, and the total amount of global liquid water increases. But the specific heat of liquid water is higher than that of ice and snow. The increased heat due to the greenhouse effect did not significantly increase the temperature of water, because the total amount of liquid water on the earth increased. Although the increased heat due to the greenhouse effect significantly increased the temperature of rocks and land on the earth, it did not significantly increase the temperature of the whole earth because of its heat exchange with liquid water on the earth, which offset the greenhouse effect to some extent and delayed the melting of ice and snow on the earth.

Secondly, the global warming makes the green plants on the earth grow vigorously, and their photosynthesis absorbs more carbon dioxide (the main part of greenhouse gases) than before the global warming, and fixes some greenhouse gases, which no longer prevents the heat on the earth from radiating outward, and also offsets the greenhouse effect to some extent.

Global warming increases the total amount of liquid water on the earth, and green plants absorb more greenhouse gases, thus delaying the trend of global warming and helping to achieve balance. Of course, with the easing of the global warming trend, the increment of liquid water and main greenhouse gases absorbed on the earth is getting smaller and smaller. If the emission of greenhouse gases such as carbon dioxide is not reduced, the earth will heat up again, causing a new round of total liquid water increase and the growth peak of green plants on the earth, thus delaying the global warming trend again. Therefore, without reducing the emissions of greenhouse gases such as carbon dioxide, the above balance will be alternately formed and broken, making the earth's temperature fluctuate more than before, rather than increasing monotonously; If we reduce or fix the emission of greenhouse gases such as carbon dioxide, we can calm the fluctuation of the earth's temperature.

Forests in the world are mainly divided into three categories: frigid (northern) forests, temperate forests and tropical forests. According to experts, today's forest ecosystem is gradually formed after 8000 years of evolution of nature. Nowadays, all virgin forests have become the targets of large-scale development and utilization of logging industry. In the tropics, many forests that have disappeared now have been cut down in the past 50 years. From 1960 to 1990 alone, more than 450 million hectares of tropical forests were swallowed, accounting for 20% of the total tropical forest area in the world; Millions of hectares of tropical forests have been degraded by logging, farmland reclamation and mineral exploitation.

In addition, illegal logging and illegal trade in wood products continue to intensify all over the world, especially in developing countries with tropical forests and countries with poor government enforcement, such as Russia. This situation is further aggravated by the demand for cheap wood products in the international market.

According to the climate model, the Intergovernmental Panel on Climate Change predicts that by 2 100, the global temperature will rise by about 1.4 ~ 5.8 degrees Celsius (2.5 ~ 10.4 degrees Fahrenheit). According to this forecast, in the past 65,438+00,000 years, the global temperature will change dramatically, which will have a potentially significant impact on the global environment.

We call for protecting our common home, please save every drop of water.

In order to protect our common home, please plant more trees to slow down desertification.

In order to protect our common home, please don't use convenient bags any more.

In order to protect our common home, please don't throw waste batteries at will.

In order to protect our common home, please reduce carbon dioxide emissions.

In order to protect our common home, please take good care of flowers and trees.

In order to protect our common home, please actively publicize and protect the environment.

In order to protect our common home, please protect our common home.

When eating:

1.On April 22nd, Earth Day is a vegetarian day. Animal husbandry consumes a lot of grains and beans, as well as a lot of precious water; In order to herd cattle and raise pigs, the virgin forest was sacrificed and the greenhouse effect was produced.

Second, eat less (cook at home, eat out in moderation, and pack up and go home if you can't finish eating)

Third, fast for one day (experience the taste of environmental protection in the body)

4. Refuse to use styrofoam, and ask cafeterias or coffee shops to use paper cups (styrofoam is a carcinogen, and it also destroys the ozone layer that protects the earth. Styrofoam cups and buffet plates for drinking coffee are still rubbish after hundreds of years and continue to pollute the environment.

5. Refuse to buy alpine tea and high-cold vegetables (alpine tea and high-cold vegetables make forests disappear in Taiwan Province Province, destroy soil and water conservation in mountainous areas, fail to play a role in water storage, use a large number of pesticides and fertilizers, and pollute water sources and reservoir ecology).

◎ clothes:

1. Know the source of fabric: 1. Only natural materials such as natural cotton and hemp (organic) can be recycled. 2. Buy and maintain clothes according to the washing label to prolong the life of clothes.

Second, the demand is determined by four factors: the amount of laundry, the capacity of the home, lifestyle and economic situation. Try to control it as well as possible, and don't overdo it.

Third, the old clothes are newly worn:

1. self-cognition: consideration of body shape, skin color and lifestyle.

2. Find out the key points of fashion: such as length and color. Generally, simple and good cutting (three-dimensional cutting) can best express the interactive relationship between people and materials.

3. Accessories, such as scarves, pins, belts, etc., are small, diverse, effective and easy to collect. A small amount of clothes is a reliable accessory that highlights the artistic effect of dressing.

◎ Live:

First, use more second-hand furniture (whether buying a house or renting a house, using more second-hand furniture can not only recycle and save resources, but also help each other and enhance interpersonal friendship if flea markets for regular second-hand goods exchange can be held in offices, communities and the Internet).

Second, use planting greening to do home decoration (don't do excessive decoration at home, be simple and natural. Home decoration does not necessarily need artificial materials, it is best to use ecological natural materials. Potted plants of all kinds of flowers and plants, try to use native tree species, leave more natural soil in the courtyard at home, and use less cement or hard pavement).

Please use utensils to hold water, wash fruits and vegetables, wash dishes, brush your teeth and wash your face, so as to save precious water resources (China is the 18 water-deficient country in the world. At present, South Taiwan Province Province has fallen into severe drought, but our current water demand has reached the standard of 100. At present, the propaganda policy of water saving in France is to take a bath once a week. If our water consumption continues to deteriorate, we will face the same situation.

Fourth, the power supply and air conditioning in the room are used centrally (try to turn on the air conditioning in one room as little as possible, and try to concentrate on office when there are few people, so as to reduce the amount of air conditioning and electric lights).

◎ Line:

First, take the stairs instead of taking the elevator (people who live in the building, whether in the office or at home, might as well take the stairs instead of taking the elevator if they are not in a hurry, which will save energy and exercise).

Second, go out and walk more, ride a bike, use the public transport system, drive less and ride a motorcycle.

◎ Other:

1. If you keep a pet, please refuse to buy a cat and dog pest control ring (when you discard the cat and dog pest control ring, its pesticide composition is very destructive to the earth and will cause serious harm to the animal's body).

2. Refuse to buy products that use animals for experiments (a large number of cruel and unnecessary animal experiment plans not only waste taxpayers' taxes, but also cause natural genetic problems, which do not help and improve the ecological environment and major health problems in Taiwan Province Province.

Refuse to ride or use balloons (balloons are difficult to decompose chemicals and cause serious pollution to the earth. In addition, when the balloon floats away, it may lead to the death of wild animals (eagles, whales or turtles, etc.). ). (Note: Since June 1 2008, China has implemented the system of paid use of plastic shopping bags in all supermarkets, shopping malls, bazaars and other retail places to encourage consumers to carry cloth belts and shopping baskets again and reduce the use of plastic bags. )