Is the global climate warming or cooling?

Since 20 10, some places have suffered from extreme cold, cold current, snowstorm and other disasters. But some places are warmer than usual. This makes people wonder: Is it getting warmer or colder?

The organization that puts forward global warming is mainly the United Nations IPCC, which is jointly established by two organizations under the United Nations, the World Meteorological Organization and the United Nations Environment Programme. Scientists in this institution believe that human activities have an increasingly serious impact on the climate. The world emits 654.38+0.2 billion tons of carbon dioxide into the sky every year. Carbon dioxide can absorb a lot of heat in the surface and lower atmosphere, and prevent heat from being lost to the air, just like glass in a greenhouse, so scientists use it? Greenhouse effect? This word illustrates the role of carbon dioxide. The higher the carbon dioxide content in the atmosphere, the more obvious the trend of climate warming.

In addition, how are some trace gases produced in the atmosphere? Greenhouse effect? Far more than carbon dioxide. These trace gases include methane produced by organic matter decay, automobile exhaust and nitrous oxide released by nitrogen fertilizer in soil.

In addition, there are more and more artificial heat effects in cities. With the increasing scale of urban construction and development, the population is increasing. Make the urban temperature 0.5℃ ~ 1℃ higher than that in the suburbs. This phenomenon is called. Urban heat island effect? .

Some scientists predict that under the long-term effect of the greenhouse effect, by 2 1 century, the earth's winter will no longer exist, and all the ice and snow will melt. This will directly lead to sea level rise, and the low-lying areas along the Pacific Ocean and the Indian Ocean will be submerged by seawater.

A view contrary to the above is the cooling theory. Some scientists published their research results, pointing out that the earth is developing in the direction of low temperature and humidity. Through satellite temperature measurement, NASA scientists have proved that the average temperature of the earth has not risen from 1979 to 1988, and is even falling. In the northern hemisphere, the temperature increased slightly in 10, but it decreased in the southern hemisphere. Generally speaking, the earth is getting cold. Others regard this cold climate as? Little Ice Age? The coming omen is that the world climate will enter the ice age from 2 1 century.

Some experts pointed out that although there was a period of extremely cold weather in winter in the northern hemisphere, the general trend of global warming will not change greatly, and the general trend of global warming cannot be confused with the severe cold weather in a winter, nor can it be considered that the two are opposite. On the contrary, there is an internal relationship between them. Some scientists predict that there may be short-term cold weather in Europe or the northern hemisphere under the background of global warming. This is scientifically based, because the first effect of global warming is to lead to the imbalance of the earth's climate system, which in turn leads to extreme weather events.

Scientists have different opinions on the prediction of climate warming or cooling, and there are great differences. This debate will continue.