Briefly describe the harm caused by global climate change?

1. Climate warming, melting glaciers and rising sea levels have led to the loss of coastal mudflats, mangroves, coral reefs and other ecological groups, coastal erosion due to global warming, seawater intrusion into the freshwater layer under the coastal land, coastal land salinization and other terrible consequences. As a result, the natural ecological environment in coastal areas, estuaries and bays is unbalanced, which brings disasters to the coastal ecological environment system.

2. The water area has increased. Water evaporation is also more, the rainy season is prolonged, and floods are more frequent. The chances of being flooded increase, the degree and severity of being affected by wind disasters increase, and the life of reservoir dams is shortened.

The increase of water may melt the ice and snow in Antarctic Peninsula and Arctic Ocean. Polar bears and walruses will be extinct.

4. Many small islands will disappear without a trace; Will be infected with infectious diseases such as malaria ...

5. Because of thermal inertia, the existing wēn cavity gas will continue to affect our lives. "

6. The increase of W ē n degree will affect the fertility of human beings, and the sperm activity will decrease with the increase of W ē n degree.

Impact on climate

No one can say how serious the harm will be caused by releasing more carbon dioxide and W  N cavity gas into the atmosphere in the future. Scientists are estimating the harm caused by climate change. According to the current technical level, the formation and digestion mechanism of carbon dioxide in the atmosphere can only be clarified in 2004, and how the W-N cavity effect is produced can be clarified. Only in 2006 can we accurately predict the sea level rise caused by the rise of the earth's W ē N, however, it will take 2050 to really understand all this. Obviously, neither scientists nor experts at zhèng Chui will wait for further results before taking preventive measures. The present observations and research results should be made public, so that people will not have to swallow the bitter fruit in 50 years.

Wēn cavity effect has been playing a role since the formation of the earth. If there is no W-cavity effect, the earth's surface will be extremely cold, the W-N degree will drop to MINUS 20℃, the ocean will freeze and life will not form. Therefore, what we are facing is not whether there is a W-cavity effect, but the problem that humans emit a large amount of W-cavity gas into the atmosphere through excessive combustion of fossil fuels, which leads to the W-cavity effect and the rapid change of the earth's climate.

What kind of influence will wēn cavity effect have? Due to the burning of fossil fuels and the deforestation of a large number of forests, the concentration of carbon dioxide in the earth's atmosphere has increased. Due to the W-N cavity effect of carbon dioxide and other gases, the global average W-N degree has increased by about 0.3-0.6℃ in the past 100 years, and it is expected to increase by 1-3℃ in 208630.

When the world average wēn degree rises 1℃, great changes will take place: sea level rises, alpine glaciers shrink, and the snow area shrinks. With the global gas wēn rising, it will lead to unbalanced precipitation, with precipitation increasing in some areas and decreasing in some areas. For example, the drought in the Sahel region of West Africa has been severe since 1965; Since 1965, the precipitation in northern China has decreased year after year. Compared with the 1950s, the precipitation in the north of huá decreased by 1/3, and the water resources decreased by 1/2. The drought-stricken area in China is about 400 million mu every year. In normal years, the whole irrigation area lacks 30 billion cubic meters of water, and the city lacks 6 billion cubic meters of water.

Due to the increase of gas wēn, the global sea level has been rising at the rate of 1-2 mm per year in the past 100 years. It is predicted that the sea level will continue to rise by 30-50 cm by 2050, which will flood a large number of low-lying areas along the coast. In addition, due to climate change, climate disasters such as drought, flood and low wēn have intensified, resulting in global economic losses of more than tens of billions of dollars every year.

melting of glaciers

In recent years, due to the discharge of "wēn chamber" gas and the wēn chamber effect, people have observed the melting of alpine glaciers from Patagonia to Switzerland. In South Asia, the question is not whether glaciers are melting, but how fast they are melting. Although many adverse effects of global warming may not become very serious until the end of February1century, glacial meltwater in Nepal, India, Pakistan, Midtown and Bhutan may soon bring trouble to people.

A research report of the International Snow and Ice Commission (ICSI) pointed out: "The glaciers in the Himalayas are retreating faster than anywhere else in the world. If the current melting rate continues, these glaciers are likely to disappear before 2035. " Said Ha Bosco Wong, head of the International Snow and Ice Commission, said: "Even if the meltwater of glaciers dries up within 60 to 100 years, the scope of this ecological disaster will be shocking."

Glaciers in the East Himalayan Mountains located in the liú domain of Ganges River are the most serious, and those distributed on the "roof of the world" from Bhutan to Kashmir retreat the fastest. Take the 3-mile-long barna Glacier as an example. This glacier is one of many glaciers formed by the collision between India's second largest land and Asia's largest land 40-50 million years ago. Starting from 1990, it retreated half a mile. After the severe sub-arctic winter in 1997, scientists had predicted that this glacier would expand, but it retreated further in the summer of 19.

Disease no.4

Paul Perstein of the Institute of New and Recurrent Diseases of Harvard University noticed that plants also moved with the snow line, and plants on mountain peaks all over the world were moving upwards. With the warming of mountain peaks, the higher altitude environment is more and more conducive to the survival of mosquitoes and microorganisms such as plasmodium.

1pet-name ruby Since 1987, tropical infectious diseases such as West Nile disease dú, malaria and yellow fever have occurred in Florida, Mississippi, Texas, Arizona, California, Colorado and other places in the United States, which has repeatedly confirmed experts' scientific inference that some tropical diseases will spread to colder areas due to climate warming.

New ice age

Another study on global warming is even more surprising. As the Arctic ice sheet melts, rainfall increases and wind types change, a large amount of fresh water is flowing into the North Atlantic, thus causing damage to the Gulf of Mexico. It is these warm ocean currents that bring warm surface water from the Caribbean to the northwest of Europe, and make Europe form a warm climate. Once the Mexican warm current liú is cut off due to global warming, the wēn degree in northwest Europe may drop by as much as 5-8℃, and Europe may face a new ice age!

This study was conducted by the Scottish Marine Laboratory in Aberdeen, which analyzed more than 17000 seawater salinity measurements from the waters of Lan Islands to the waters of F-M-Luo Islands since 1993. In the past 20 years, the salinity and concentration of deep seawater in the south of Liwu have become lower and lower, which indicates that more fresh water has flowed into this area from the North Atlantic. These new data fully prove the computer model designed by German scientists about three years ago for the first time.

The content of carbon dioxide in the atmosphere is rising sharply, and the world population will reach 654.38+000 billion before 2050. "Our world is moving towards replacing existing natural resources with artificial facilities," said David Tillman of the University of Minnesota. However, we haven't mastered the knowledge about natural ecosystems. In the Permian Miocene extinction 245 million years ago, 96% Miocene species died. Later, with the emergence of many new species, the earth finally recovered its rich population, but this process has gone through 100 million years. Wilson said: "Some people think that nature will revive everything destroyed by human beings." As the saying goes, "As long as there is enough time, everything can happen." Maybe nature can really restore everything, but this long process is meaningless to modern human beings anyway.

Mark Thun once said that the most touching feature of the weather is its diversity. 1 After many centuries, we are still trying to predict the weather accurately, but we have little effect in controlling the climate. However, the damage to the environment is unprecedented.

1. Ecology

First of all, global warming leads to sea level rise and precipitation redistribution, which changes the current world climate grid Jú; Secondly, global warming affects and destroys the biological chain and food chain, bringing more serious natural pollution. For example, there is a migratory bird that flies from Australia to northeast China every year to spend the summer. However, due to global warming, the air wēn in the northeast of China rises and the summer is prolonged, so the time for this bird to leave the northeast is also warmer, and the time for returning to the northeast is also delayed accordingly. As a result, a pest eaten by this migratory bird flooded and destroyed a large area of forest. In addition, extreme events related to the environment have increased, such as droughts and floods.

2. Zheng Chuizhi

Limiting carbon dioxide emissions is equivalent to limiting energy consumption, which will definitely have a restrictive impact on the world. Whether developing countries reduce emissions or developed countries reduce emissions has become the focus of discussion. The emission of gas in chamber W 275N in developing countries is increasing, and the problem of "emission reduction" after 20 13 will inevitably focus on developing countries. The scientific problem of preventing global warming will inevitably lead to the problem of "North-South relations", thus making the climate issue an international issue.

3. Climate

Global warming has increased precipitation in a large area of land, especially in the middle and high latitudes, and reduced precipitation in some areas such as Africa. In some areas, the frequency and intensity of extreme weather and climate events (El Nino, drought, flood, thunder and lightning, hail, strong wind, high humidity weather and dust, etc.). ) have increased.

4. Ocean

With the rise of global gas wēně, the amount of water vapor evaporated in the ocean has greatly increased, which has aggravated the warming phenomenon. The reduction of the total heat capacity of the ocean can restrain global warming. In addition, because the ocean releases excessive carbon dioxide into the atmosphere, the real culprit is the plankton community in the ocean.

5. Crops

The impact of global warming on crop growth has both advantages and disadvantages. First, the change of global air wēn directly affects the global water cycle, causing droughts or floods in some areas, resulting in crop yield reduction. Too high wēn is not conducive to seed growth. Second, the increase of precipitation will actively promote crop growth, especially in arid and water-deficient areas. The increase in the amount of carbon dioxide hán accompanied by global warming will also promote the photosynthesis of crops, thus increasing the yield.

6. People are healthy

(1) Global warming directly leads to high W N, heart disease and various respiratory diseases in some areas in summer, which kills many people every year, especially newborns and the elderly. (2) Global warming leads to the increase of ozone concentration. Ozone in the air is a very dangerous pollutant, which can destroy the lung tissue of bad people and cause asthma or other lung diseases. (3) Global warming will also cause the spread of some infectious diseases.