The climate in Henan Province is changing rapidly. What are the reasons for "from summer to winter" in a week?

The lowest temperature in Henan Province dropped below 15℃. You know, on August 2 1 a week ago, the highest temperature in Henan was 40℃. It is found that on the streets of Zhengzhou, many citizens have added warm clothes, coats and trousers are common clothes, and few people wear shorts. According to the Henan Meteorological Observatory, the whole province is cloudy today, with rain in most areas and heavy rain or rainstorm in central and southeastern Henan. Today, the lowest temperature in Henan Province is below 15℃, and the highest temperature in the central and western regions and north-central regions is only 20℃.

With the arrival of early autumn, although some areas are obviously getting cold, there are still many areas with continuous high temperature. Dry things are in the air, which is a high incidence of fire accidents. A little carelessness will cause economic losses and casualties. I would like to remind everyone to pay attention to fire prevention at all times. The impact of human activities on climate change. More and more studies show that in the past century, human activities have intensified the change process of the climate system. The latest authoritative report "Report of Working Group I of the Fourth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC)" holds that human activities are responsible for 90% of climate change in the past 50 years. The study on the possibility of climate change caused by human activities increasing the concentration of greenhouse gases in the atmosphere can be traced back to the end of 19. 1896, Swedish scientist Svante. Many scientists have done some research on this problem.

The United States has begun to observe the concentration of carbon dioxide at the Hawaii Observatory, which officially marks the beginning of human research on climate change. Among fossil energy sources, coal has the highest carbon content, followed by oil and natural gas. Carbon dioxide and methane emissions from coal, natural gas and natural gas leakage during the exploitation of fossil energy; Industrial processes such as cement, lime and chemical industry emit carbon dioxide; Methane emission during digestion of ruminants such as rice fields, cattle and sheep; Changes in land use will reduce the absorption of carbon dioxide; Garbage releases methane and nitrous oxide. If the concentration of greenhouse gases in the atmosphere continues to increase, which further blocks the long-wave radiation emitted by the earth into space, to maintain the radiation balance, it is necessary to warm the ground and increase the amount of long-wave radiation.