What is Climate Change?

Climate change refers to the change in the average state of the climate over time, that is, one or both of the average state of the climate and the deviation (anomaly) have statistically changed significantly. The larger the deviation value, the greater the magnitude of climate change and the more unstable the climate state. Broadly refers to changes in climatic conditions at various time scales. It ranges from the longest billions of years to the shortest interannual changes. It can be divided into climate change in geological period, climate change in historical period and modern climate change. The scale of climate change during the geological period is about 104 to 108 years, which is mainly studied indirectly based on animal and plant fossils and various relics. According to research, several glacial and interglacial cyclical changes have been experienced during this period; the scale of climate change in historical periods is about 102 to 103 years, and humans have appeared during this period, mainly based on historical documents, changes in flora and fauna, and tree rings. Analysis and other means. During this period, the warm and cold periods, the dry and the wet periods have alternated, and different regions of the world have both synchronous and reverse changes. The scale of modern climate change is 100-101 years, and the system uses meteorological records to study. It is generally believed that from the end of the 19th century to the first half of the 20th century, the climate in the northern hemisphere has warmed, especially in the Arctic and high latitudes. Temperatures have risen significantly, while the southern hemisphere has not changed much. The warming phenomenon reached its peak around 1940 and it began to change later cold. The causes of climate change are complex.

Climate change refers to changes in the climate state over a long period of time. It is usually reflected by the difference in statistics of climate elements such as temperature and precipitation in different periods. The length of change varies from the longest billions of years to the shortest interannual change.

Climate change refers to a statistically significant change in the average state of the climate or a climate change that lasts for a long period of time (typically 30 years or more). Climate change includes not only changes in average values, but also changes in variability

In the first paragraph of the United Nations Framework Convention on Climate Change (UNFCCC), the UNFCCC refers to "climate change" that alters the composition of the atmosphere due to human activities and "attributes to natural causes"

The cause of climate change may be natural internal processes, or external forcing, or artificially continuous

Optimizing energy structure, improving energy efficiency, adjusting industrial structure, researching and applying low-carbon technologies, and changing concepts to enhance low-carbon consumption awareness are considered important ways to tackle climate change globally.

In order to actively cope with global climate change and carry out overall national adaptation work, the National Development and Reform Commission, the Ministry of Finance, the Ministry of Housing and Urban-Rural Development, the Ministry of Transport, the Ministry of Water Resources, the Ministry of Agriculture, the Forestry Bureau, the Meteorological Bureau and the Ocean Bureau jointly formulated the " National Climate Change Adaptation Strategy. ^[10]