Global climate change is caused by burning fossil fuels, which will emit a lot of greenhouse gases. Extreme climate impacts under the background of global warming are frequently staged around the world. Blizzard, hurricane, flood and drought ... Global warming also leads to glacier collapse and melting, sea level rise, grain production reduction and species extinction ... Before the irreversible global warming disaster comes, we must save energy and reduce emissions, give up fossil fuels, switch to renewable energy, save energy and improve energy efficiency.

The impact of climate change is very extensive, involving national defense, human health, international finance and other fields.

According to scientists' prediction, by 2050, there will be a shortage of fresh water supply in most parts of Asia, including Central Asia, South Asia, East Asia and Southeast Asia, especially in some large river basins. In coastal areas, especially in densely populated areas in South Asia, East Asia and Southeast Asia, the flood risk will increase significantly; Under the background of global climate change, with the rapid development of industrialization, urbanization and economy, the pressure on natural resources and environment in Asia will further increase. In addition, the impact of climate change on human health may be manifested as diarrhea caused by floods and droughts, and its morbidity and mortality will increase significantly.

As far as China is concerned, climate warming is the main reason for frequent abnormal meteorological disasters. Shanghai, for example, is located at the mouth of the Yangtze River, with an average elevation of only 4 meters, which is vulnerable to the impact of tides. In terms of cargo tonnage, Shanghai is the busiest port in the world. In 2006, sea level rise, storms and seawater intrusion caused damage to farmland, houses and wetlands near Shanghai. The WWF report predicts that by 2050, the sea level will rise by 30-50 cm, which will lead to the inundation of about 54,000 square kilometers (more than half of the area) in Shanghai. Hong Kong, Singapore, Kuala Lumpur, Bangkok and Ho Chi Minh City are also facing great risks of global climate change.

Global climate change has seriously affected China's food security. China is a big agricultural country, and its agricultural production is greatly influenced by natural conditions. By the second half of 2 1 century, the output of several major crops, such as wheat, rice and corn, will probably decrease by 37%. If no measures are taken, climate change will seriously affect China's long-term food security.