What causes global warming?

Question 1: What causes global warming? There are many reasons for global warming, which can be summarized as: human factors 1. In recent years, the population explosion 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 constituted a major global problem and 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, sea level changes are 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. Improper agricultural production is the main cause of soil erosion and desertification caused by soil erosion, salinization and desertification. As we all know, good vegetation can prevent soil erosion. But today, human activities, such as excessive deforestation, land reclamation for agricultural production and overgrazing, are still seriously destroying vegetation. At present, on average, 20 hectares of forests are destroyed, 65,438+00 hectares of land are desertified and 47,000 tons of soil are eroded every minute in the world. Soil erosion reduces soil fertility and water retention, thus reducing soil biological productivity and its ability to maintain productivity; It may also lead to large-scale floods and sandstorms, causing huge economic losses to society and deteriorating the ecological environment. 5. The sharp decline of forest resources is worldwide, and the forest area is decreasing sharply due to natural or man-made factors. 6. The harm of acid rain The impact of acid rain on the 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 that accelerate the extinction of species 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 the 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 chemicals with increasing toxic waste pollution factors not only pose a serious threat to human survival, but also bring harm to the ecological environment on the earth's surface. Natural factors 1. The world is in a warm period. 2. Periodic orbital changes of the earth. 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.

Question 2: What are the man-made causes of global warming?

1. Population explosion factor

The rapid growth of population 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 amount of carbon dioxide emitted by itself every year 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

The increasingly serious environmental pollution has become a major global problem, and it is also one of the main factors leading to global warming. The research on global climate change in 2 1 century has clearly pointed out that the temperature of the earth's surface has been rising since the end of last century.

3. Deteriorating factors of marine ecological environment

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. Factors of sharp decline of forest resources

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

natural cause

1. Volcanic activity

2. Periodic orbital changes of the earth.

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.

3. Icebergs melt

Scientists have found that if the global temperature continues to rise, the melting of Arctic icebergs will release a large number of toxic chemicals trapped in ice and cold water. The researchers warned that these large amounts of poisons gathered in the polar regions are unknown, and their release will seriously endanger the living environment of marine life and human beings. These seeping chemicals include pesticides DDT and chlordane. All these are persistent organic pollutants, which may cause cancer and birth defects, and were previously captured by Arctic ice and frozen water. However, scientists in Norway and Canada found that global warming was making these pollutants "reborn" when monitoring the measurement results of 1993 and 2009.

4. Solar activity

Some experts believe that climate warming is related to the solar cycle and has little to do with human activities. Russian scientists believe that the warming cycle of Mars is consistent with that of the Earth, mainly due to the sun; Some scientists in the United States also believe that the main cause of climate change is the sun. From 1975 to 2000, the solar magnetic cycle curve is almost consistent with the surface temperature curve in the northern hemisphere. In addition, Danish astronomers believe that the main cause of climate change is the universe. But more people think that human activities are the main cause of climate warming. However, researchers in Japan and Denmark recently pointed out that the increase of greenhouse gases is not the only cause of climate warming, but the change of solar activity has also played a role in promoting it.

Question 3: What kind of human activities will lead to global warming 1? Carbon dioxide emitted by human respiration.

2. Burning chemical fuels such as oil and coal.

3. Deforestation and burning

4. Improper agricultural production causes soil erosion and desertification.

5. Air pollution caused by industrial production and automobile exhaust.

6. Acid rain and water pollution caused by improper industrial production

7. Toxic chemical wastes are constantly produced, and garbage and wastes are treated in unreasonable ways such as direct landfill.

Question 4: What will global warming cause? Global warming is indeed a problem, which needs dialectical analysis:

First of all, global warming is a good thing:

1. First of all, climate warming will increase atmospheric water vapor and bring more rain to the inland. Northern Africa, central Asia, and central and western China will become wet. "The climate in northwest China will change from warm and dry to warm and humid." The Sahara desert in Africa will shrink, and the Gobi desert in China will gradually be covered with green clothes. These places will become more livable.

Secondly, climate warming will make the global vegetation more lush. Forests have expanded, grasslands are greener and trees are growing faster. According to statistics, the incidence of forest fires in California in recent years has exceeded any period in history. While having a headache, the United States found that an important reason for frequent mountain fires is that the plants on the mountain are too lush. Winter is coming, and the dry monsoon is blowing, which is easy to cause fires. In recent years, the forest coverage in China is also increasing rapidly, which is due to human factors and God's help.

3. Climate warming makes crops grow more efficiently. With the slow emergence of "warm winter", the accumulated temperature on the ground rises, the wintering crop areas generally move northward, the crops tiller well and the yield generally increases. In recent ten years, the global crop output has increased continuously, the climate has become warmer, and natural disasters have decreased. Abundant rainfall is the decisive factor. The United States, India, China and other important grain-producing areas in the world are rich in grain, which has ensured a sharp decline in the world's hungry population. The bumper harvest of crops and the high yield of pasture have greatly increased the number of various livestock. For example, Australia, New Zealand and other "sheep-backed countries" intend to impose a "fart tax" on cattle and sheep, because ruminants will release a lot of methane (fart) to pollute the air.

Finally, global warming causes people to reduce energy use and greenhouse gas emissions. This year's warm winter has led to a sharp drop in heating oil used by Americans, and the direct result is a drop in international oil prices. The warm winter in China also saves a lot of energy for the heating department, and the tension and disputes caused by heating are rarely heard.

Second, the harm of global warming:

1, the influence of sea level rise

In the past century, the sea level has risen by 14.4cm, and that of China by11.5cm.. The main reason for sea level rise is the thermal expansion of seawater. When the ocean warms, the sea level rises. Global warming will lead to the melting of icebergs in the north and south poles of the earth, which is also one of the main reasons for the rise of sea level. The direct impact of sea level rise has the following aspects:

The lowlands were flooded:

Britain heightens dams to cope with climate warming

Global warming makes the sea level rise and the frequency of storms increase, which makes it impossible for the British to raise flood control dams politically. Statistics released by British officials recently show that in the past 20 years, due to global warming, the Thames water level has risen, and local institutions have to raise flood control dams 88 times to ensure the safety of Londoners' lives and property. It is reported that people now raise dams four times a year on average. It is estimated that before 2030, the frequency of heightening dams will reach 30 times a year. China Environment News 2004- 10- 19

(2) Coastal erosion

(3) The salt content of surface water and groundwater increases, which affects urban water supply.

(4) The groundwater level rises.

(5) Tourism is endangered (the sea level rises by 50m, the coastal tourist areas of Dalian, Qinhuangdao, Qingdao, Beihai and Sanya are 365 and 438+0-366 behind, the beaches are lost by 24%, and the beaches of Beidaihe are lost by 60%. China Land and Resources Bulletin reported in 2002 that coastal tourism has become the largest industry, with an output value of 250.3 billion yuan, accounting for 34.6% of the total output value of marine industry.

(6) Affect the life of coastal and island residents (accounting for13 of the world population) and make them threatened. If the polar ice sheet melts, economically developed and densely populated coastal areas will be swallowed up by seawater, and low-lying island countries such as Maldives and Seychelles will disappear from the ground, and coastal cities such as Shanghai, Venice, Hong Kong, Rio de Janeiro, Tokyo, Bangkok and new york, as well as Bangladesh, the Netherlands and Egypt will also be doomed.

2, the impact on animals and plants

Climate is the main factor that determines the distribution of biological communities. Climate change can change the adaptability of different species in a region and the competitiveness of different populations in the ecosystem. Animals and plants in nature, especially plant communities, may adapt to the speed of global warming, thus encountering bad luck. Past climate change (such as the ice age) has made many species disappear, and the future climate will make some species disappear in some areas, while some species will disappear from the climate ... >; & gt

Question 5: What are the main causes of global warming? BIGBANG's energy is still enlarging the gap between galaxies, and the distance between the earth and the sun is also enlarging. It was supposed to make the earth cool, but in recent decades, the earth is getting warmer. So some people play the board of global warming on human's own fart clothes. In fact, this board is really unfair, so unfair, because the carbon dioxide produced by human beings-and so on-has no effect on the global climate, but it does, and it is only nine Niu Yi hairs. Then why is the earth slowly moving away from the sun and climate warming in the opposite direction? We know that the tilt of the earth axis makes the earth have four seasons. Then the axis of the sun is tilted, and the solar system will inevitably produce four seasons similar to the earth. That is, the sun is now approaching the equator from the Tropic of Capricorn or Tropic of Cancer, which is similar to the earth, making the galactic light more and more direct to the solar system. In other words, the global warming temperature is caused by more and more direct sunlight from the Milky Way. Spring and autumn are abrupt changes, and so are the spring and autumn of the solar system caused by the tilt of the sun axis, so the earth is not only warming, but also often mixed with some extreme weather.