Why does global warming cause the temperature to rise?

The temperature rise caused by global warming is due to the increase of greenhouse gases and the greenhouse effect.

Increased greenhouse gases: Human activities, especially burning fossil fuels and deforestation, release a lot of greenhouse gases, including carbon dioxide, methane and nitrous oxide. These gases gradually accumulate in the atmosphere, forming a greenhouse gas layer, preventing the loss of heat on the earth's surface and warming the earth.

Greenhouse effect: the existence of greenhouse gases leads to the occurrence of greenhouse effect. Solar radiation enters the earth's atmosphere, and some of it is absorbed by the earth's surface, then converted into heat and radiated again. Greenhouse gases can block this part of thermal radiation, make it stay in the atmosphere, and raise the surface temperature of the earth.

Positive feedback mechanism: global warming will also trigger a series of positive feedback mechanisms, further aggravating the temperature rise. For example, the melting of glaciers and sea ice will cause more solar radiation to be absorbed and accelerate the temperature rise. In addition, melting glaciers will lead to rising sea levels, thus changing ocean circulation and climate patterns.

Global warming and rising temperature have brought a series of impacts, including the increase of extreme weather events, the rise of sea level, the retreat of glaciers and permafrost, and the decrease of biodiversity. Therefore, it is very important to reduce greenhouse gas emissions and take countermeasures to meet the challenge of global warming.