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What causes 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

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. During the period of 1975 ~2000, the solar magnetic circulation 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.

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All related issues

What are the causes of global warming?

The main reason for global warming is that humans have used a lot of fossil fuels (such as coal and oil) and released a lot of greenhouse gases, such as carbon dioxide, in the past century. These greenhouse gases cause global warming. Global warming will redistribute global precipitation, melt glaciers and frozen soil and raise sea level, which will not only endanger the balance of natural ecosystems, but also threaten human survival. On the other hand, due to the greenhouse gas emissions from the land, the temperature in the mainland rises and the temperature difference with the ocean becomes smaller. Recently, the airflow has slowed down, and the smog can't be blown away in a short time, which has led to an increase in smog weather in many cities, affecting human health. In order to stop the global warming trend, the United Nations specially formulated 1992 "United Nations Framework Convention on Climate Change", which was signed into effect in the Brazilian city of Rio de Janeiro in the same year. According to this convention, developed countries agreed to reduce their carbon dioxide and other "greenhouse gases" into the atmosphere to the level of 1990 by the year 2000. The greenhouse effect has been working since the formation of the earth. If there is no greenhouse effect, the surface of the earth will be extremely cold, the temperature will drop to MINUS 20℃, the ocean will freeze and life will not form. Therefore, we are not faced with the problem of whether there is a greenhouse effect, but the problem that human beings emit a lot of greenhouse gases into the atmosphere by burning fossil fuels, which leads to the greenhouse effect and the rapid change of the earth's climate. Baidu encyclopedia-global warming

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What is the root cause of global warming,

The main reason for global warming is that human beings have used a lot of fossil fuels (such as coal and oil) and released a lot of greenhouse gases such as carbon dioxide in the past century. These greenhouse gases cause global warming. In the 20th century, the world average temperature rose by about 0.6 degrees Celsius. In the northern hemisphere, the thawing period of ice and snow in spring is 9 days earlier than that before 150, but the start time of autumn frost is about 10 days. The 1990s was the warmest decade since the mid-Kloc-0/9th century when temperature records began. The hottest years recorded are: 1998, 2002, 2003, 200 1, 1997. Extended data:

Introduction to basic hazards: 1. The heat energy brought by the rising temperature will provide great kinetic energy to the air and ocean, thus forming large-scale or even super-large-scale disasters such as typhoons, hurricanes and tsunamis. More and more disasters are suffered and faced every year, and more and more lives and money are lost, which is more and more unacceptable. Disasters such as typhoons and tsunamis not only directly destroy buildings and threaten human life safety, but also bring secondary disasters, especially the heavy rainfall brought by typhoons and hurricanes, which will lead to mudslides, landslides and other disasters, seriously threatening traffic safety and residents' life safety. 2. The rising temperature will not only absorb water directly from the ocean, but also from the land, resulting in a large area of drought in inland areas, thus reducing food production and feed production. Food and meat products will face scarcity, which directly threatens national stability. Panic and fighting caused by food will no longer happen in backward villages. Icebergs melted by the rising temperature are the main source of fresh water for our survival. Most of our underground fresh water reserves come from iceberg meltwater. When the temperature balance is normal, the ice and snow circulation system of icebergs, that is, icebergs in summer melt down the mountain and flow into the ground, accumulating fresh water for the plain area and playing a filtering role. In winter, water returns to the mountains in the form of steam, and through a lot of snowfall, ice and snow accumulate again, which is also a filtering process. The whole circulation process ensures the stable balance of fresh water. Nowadays, global warming makes the ice and snow accumulation speed of icebergs far less than the melting speed, and even some icebergs no longer accumulate, cutting off local drinking fresh water. This will bring conflicts and wars caused by water shortage. The natural food chain is gradually broken by the rising temperature. 5. The increase of carbon dioxide content in the atmosphere will lead to the increase of carbon dioxide content in the ocean, carbonation of the ocean and killing a large number of microorganisms. Rising ocean temperature will also destroy a large number of coral-centered biological chains. The disappearance of bottom food makes the marine food chain disintegrate rapidly from the bottom and spread out of the ocean. Because there is no food, a large number of marine life and other creatures that feed on marine life will die. The death of a large number of creatures in the ocean will pollute the ocean and accelerate the death of other creatures; At the same time, it releases a lot of greenhouse gases, accelerates global warming and forms a vicious circle. Baidu encyclopedia-global warming