Greenhouse gases make the global climate warmer, and China is no exception. There was a severe drought in Yunnan in March 2010, and floods in the south in July. In 2011, Heilongjiang Province, China’s largest commercial grain base, also suffered the worst drought in its history. Tibet in the snow. In the context of global warming, glaciers are retreating, snow cover has been reduced for many years, and the amount of water melted into rivers in the future will decrease, which will have a major impact on China’s water security.
The climate of China’s Yangtze River Basin has shown a phenomenon of “drought and flood”, which requires attention to the impact of climate change on urban planning. This mainly lies in:
①Drought impact. At present, insufficient attention has been paid to the water storage function in urban planning and construction.
② Waterlogging. Because the design concept of the urban underground pipeline network stays at the level of heavy rain in 20, 30 or 50 years, extreme weather caused by climate change shows a “once in ten years” change, and the existing system of the city has become common. Can not meet the needs of climate change.
Over the past three decades of reform and opening up, China’s economic aggregate has risen from 362.41 billion yuan in 1978 to 47,1556 billion yuan in 2011, the urban population has increased from 172 million to 637 million, and the level of urbanization has increased from 17.92% to 51.2%. . China has entered a stage of rapid industrialization and urbanization, and energy consumption and corresponding total CO2 emissions have also increased rapidly. Since 2000, 2/3 of the increase in global CO2 emissions has come from China. By 2006, China became the world’s largest CO2 emitter. Obviously, China’s current large and fast growth of greenhouse gas emissions are mainly due to the large population and the development stage of industrialization, urbanization, and modernization. From the perspective of per capita carbon emissions, China is lower than Australia, the United States, Canada, Japan, South Korea, Russia, and the European Union, and equal to Mexico, but higher than Brazil, Indonesia and India.
CO2 emissions are linked to urbanized areas
According to research by Qu Jiansheng and others, China’s total CO2 emissions in 2006 showed a trend of decreasing from the eastern coastal areas to the central and western regions. High-emission areas were mainly concentrated in the eastern coastal areas and a few inland provinces such as Inner Mongolia and Henan, forming Inner Mongolia as a whole. A high-emission continuous belt of Hebei-Liaoning-Shandong-Jiangsu-Zhejiang (mainly the Bohai Rim and the Yangtze River Delta) and the Pearl River Delta high-emission area. From the perspective of the CO2 emission density by province, it is mainly concentrated in densely urbanized areas such as the Bohai Bay, the Yangtze River Delta, and the Pearl River Delta. The CO2 emissions per square dry meter are all above 1,800t. Shanghai is as high as 26638.77t/km2, which is 3.26 times higher than the second place, Tianjin. In contrast to the spatial distribution pattern of Chinese cities, the CO2 emission density of provinces and regions has a good correlation with the continuous urban areas.