What caused the global weather anomaly?

Scientists believe that the past climate change may be related to the slow change of the earth's orbit, which may be caused by the gravitational disturbance of other planets in the solar system, changing the geographical and seasonal distribution of solar radiation energy, and the long-term change of solar emissivity will affect the formation and melting of ice sheets, thus affecting the current circulation and atmospheric circulation; In addition, solar irradiance will also affect the absorption and release of greenhouse gases such as carbon dioxide and methane by plants, rocks, soil and oceans, which will lead to climate change.

However, the global warming in the past 100 years was mainly related to human activities. The most important reason is that a large number of coal, oil, natural gas and deforestation are burned, and a large amount of carbon dioxide is added to the air every year. This gas can absorb thermal radiation, leading to the "greenhouse effect", which makes the heat emitted by the earth into space less than that absorbed from the sun, and as a result, the global weather is getting hotter and hotter.

According to a report published by the World Meteorological Organization not long ago, the average temperature of the earth rose by about 0.6℃ in the 20th century alone, mainly in the last 30 years. Since 1992, the global temperature has risen by 0.02 ~ 0.03℃ on average every year, and the sea level has risen by about 1 ~ 2mm. By 2 100, the sea level may rise to 70 cm, which is the result of the melting of the earth's ice sheet caused by global warming.

Fortunately, in recent years, this problem has attracted public attention all over the world. At the international conference on global climate change held in Bali, Indonesia in 2007, governments unanimously decided to take immediate measures to prevent further climate warming.