This mainly involves the thermal expansion of seawater, because as the oceans warm, sea levels rise. Global warming will cause glaciers at the Earth's north and south poles to melt, which is one of the main causes of sea level rise. The direct effects of sea level rise include three aspects. First there is the flooding of the plains: like the higher levels in the UK in response to global warming. Global warming is causing sea levels to rise and storms to become more frequent, forcing the government to strengthen the flood control dam. According to statistics released by British authorities, over the past 20 years, due to the water level of the Thames River and the increase in global warming, local government agencies have successively increased the flood of the dam 88 times. To ensure the safety of the lives and property of the people of London. The second point is the increase in salt in surface water and groundwater. The effect of urban water supply. The third point concerns the damage caused by tourism and the influence on the lives of coastal and island residents, which are under threat. If the polar ice caps melted, economically developed and densely populated coastal areas would be swallowed up by the sea. Coastal cities of Maldives, Shanghai, Venice, Hong Kong, Tokyo, New York, Bangkok, Rio de Janeiro and Bangladesh, Netherlands, Egypt and other countries will also be