Causes, severity and impacts of global warming in China in recent years 30

Causes: Global warming refers to the phenomenon of increasing the temperature of the earth's atmosphere and oceans over a period of time, mainly due to anthropogenic factors, most likely caused by excessive greenhouse gas emissions.

Scientists from the University of California in the United States set up four 7-meter-high and one 27-meter-high sampling towers on Molau Island in Hawaii, the Pacific Ocean, to take samples four times per hour to analyze the changes in carbon dioxide.

Since the Industrial Revolution, the amount of carbon dioxide has increased dramatically, and although the photosynthesis of plants absorbs a large part of carbon dioxide, and the ocean also dissolves a part of carbon dioxide and fixes it into calcium carbonate, the amount of carbon dioxide in the air is still gradually increasing. According to the results of a joint study by the University of Virginia in the United States and the University of East Anglia in the United Kingdom, the trend of global temperature increase is very obvious in the second half of the 20th century.

impact.

Trends in temperature in the Northern Hemisphere over a millennium (1000-1950 every 50-year scale, 1950-2000 10-year scale) As ocean temperatures increase, glaciers in the Antarctic and Arctic will melt at an accelerated rate, leading to sea level rise that will inundate low-altitude coastal areas, such as the island nation of Tuvalu in Oceania. With 3 4 per cent of the world's population living less than 500 kilometres from the coastline, the shrinking land area can greatly affect human habitation and may even lead to war.

As the ocean temperature increases, water evaporation accelerates, resulting in increased rainfall, more frequent floods, larger flood areas, and serious soil erosion.

As the atmospheric temperature rises, tropical infectious diseases are spreading to high latitudes, and there are already signs of the spread of tropical infectious diseases.

As the evaporation rate rises due to the increase in atmospheric temperature, desertification in inland areas is accelerating and the desert is in danger of expanding.

While some plants and animals will reproduce faster due to warmer temperatures, the entire biodiversity will be threatened, and many species will accelerate the pace of extinction.

Due to the collapse of icebergs at the poles, the local temperature in the near polar regions of Northern Europe and South America will drop rapidly, which will seriously affect the local ecosystem and cause irreversible changes.

Global warming may have a great impact on the living environment of human beings, and human beings should at least minimize their contribution to global warming and try to slow down the trend of global warming.

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The reason: anthropogenic greenhouse gas emissions have continued to increase in recent decades!