What are the natural disasters caused by the greenhouse effect?

1) the increase of pests and diseases on the earth;

2) sea level rise;

3) Abnormal climate, increasing ocean storms;

4) The land is dry and the desertification area increases.

Scientists predict that if the earth's surface temperature continues to rise at the current rate, by 2050, the global temperature will rise by 2-4 degrees Celsius, polar icebergs will melt greatly, resulting in a sharp rise in sea level, and some island countries and coastal cities will be submerged, including several famous international cities: new york, Shanghai, Tokyo and Sydney.

The greenhouse effect will make prehistoric deadly viruses threaten human beings.

American scientists have recently warned that due to the melting of Arctic ice due to global temperature rise, prehistoric deadly viruses frozen for more than100000 years may reappear, leading to global epidemic panic and seriously threatening human life.

Scientists at Syracuse University in New York pointed out in the latest issue of Scientist that they had discovered a plant virus TOMV earlier. Because it is widely spread in the atmosphere, it is inferred that this virus has also been found in the Arctic ice sheet. So the researchers extracted four pieces of ice from Greenland, ranging in age from 5 million years to 6.5438+0.4 million years, and found the TOMV virus in the ice. Researchers say that the surface of the virus is surrounded by a solid protein, so it can survive in adversity.

This new discovery makes researchers believe that a series of epidemic viruses such as influenza, polio and smallpox may be hidden deep in the ice. At present, human beings have no resistance to these primitive viruses. When the global temperature rises and the ice melts, these viruses buried in the ice for thousands of years or more may resurface and form an epidemic. Scientists say that although they don't know the survival hope of these viruses or the chance to adapt to the ground environment again, they certainly can't rule out the possibility of the virus coming back.

Global warming is about to reach its peak in the South Pacific islands.

Global warming leads to the rapid melting of the ice sheets in the North and South Poles and the rising sea level. 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.

Farmland waterlogging and malaria are rampant.

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 were attacked by ocean forces and flooded constantly. The original area has been changed and destroyed, and almost all places have been submerged by seawater.

It is unbearable that mosquitoes and flies are swarming 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.

The Amazon rainforest is 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,

A new ice age is coming.

Another very serious consequence of global warming is the arrival of the ice age.

The melting of the Antarctic ice sheet has caused a large amount of fresh water to be injected into the ocean, and the concentration of seawater has decreased. As a result, the "ocean conveyor belt" gradually stopped: the warm current could not reach the cold sea; The cold current can't reach the warm sea. As the global temperature drops, another ice age is coming. Most parts of the northern hemisphere are frozen, and successive snowstorms and tornadoes will sweep across the mainland.