In the 20th century, the global average temperature rose by 0.4-65438 0.8℃. In the past half century, the main reason for the global temperature rise is probably the increase of greenhouse gases emitted by human beings. In the past century, the global sea level has risen by 14.4cm, and China by110.5 cm. The main reasons for the sea level rise are the thermal expansion of seawater, coastal warming and sea level rise. Global temperature rise will lead to the melting of polar glaciers, which is also one of the important reasons for sea level rise. If "global warming" is happening, there are two processes that will lead to sea level rise. Firstly, the sea level rises due to the thermal expansion of seawater. The second is that the melting of glaciers and ice in Greenland and Antarctica has increased the water content of the oceans. It is predicted that the average sea level of the earth will rise by 0.09-0.88m from 1900 to 2 100. The results also show that the increase of carbon dioxide will not only make the world warm, but also cause the adjustment of global atmospheric circulation and the expansion of climatic zones to the polar regions. The precipitation in mid-latitude areas, including the northern part of China, is decreasing, and the climate will tend to be dry due to the rising temperature and increasing evaporation. atmospheric circulation
Adjustment, in addition to mid-latitude drought, may also cause climate anomalies and disasters in other parts of the world. For example, the intensity of typhoons at low latitudes will increase, and the source of typhoons will expand northward. Rising temperatures will also aggravate the epidemic of infectious diseases. Take malaria as an example. In the past five years, the incidence of malaria in the world has tripled. At present, about 500 million people in the world suffer from malaria every year, and more than 2 million of them die.
Of course, there are also different views on the issue of atmospheric greenhouse effect. For example, some scientists used to think that the current numerical model is immature and the calculation results are too exaggerated; A rise of 0.3-0.6℃ in a hundred years is a normal climate change, which cannot be proved to be caused by the atmospheric greenhouse effect, and so on. Of course, this is a minority opinion.
Based on the impact of global warming on the environment, all countries in the world should take corresponding measures.
The earth is the only home for human beings. We should protect our mother earth!