What are the main causes of climate change?

Man-made influence mainly includes two aspects. On the one hand, people release a lot of greenhouse gases by burning fossil fuels in their daily production and life. On the other hand, changes in land use patterns, such as deforestation and reduction of cultivated land, indirectly change the concentration of greenhouse gases in the atmosphere, which may also warm the climate.

Impact of human activities on climate: The main factors influencing the world climate change in the last century are, in order of importance, the change of carbon dioxide concentration, urbanization, sea surface temperature, forest destruction, aerosol, desertification, solar activity, O3, volcanic eruption and artificial heating. It can be seen that the change of carbon dioxide content in the atmosphere is considered as the primary cause of modern climate change.

Frequent extreme weather events: Global warming has increased precipitation in Chinese mainland, especially in the middle and high latitudes, and reduced precipitation in some areas such as Africa. Frequency and intensity of extreme weather and climate events (El Nino, drought, flood, thunderstorm, hail, rainstorm, high temperature weather and sandstorm, etc.). ) have increased.

Melting of polar glaciers: the warming of the Arctic region is 1 to 3 times higher than the global average. Scientists predict that the Arctic Ocean will usher in its first ice-free summer as early as 2030. The same thing happened in Antarctica. If the polar ice sheet melts completely, the global sea level will rise by about 70 meters.