The document discusses sea level rise and its impacts. It notes that Asia has the largest population exposed to coastal flooding. Global mean sea level has risen 0.20 meters from 1901 to 2018 and is rising at an increasing rate, unprecedented over the past 3000 years. Human-caused greenhouse gas emissions are the main driver of sea level rise through ocean warming and land ice loss from glaciers and ice sheets. Depending on future emissions levels, sea level rise and extreme sea level events will continue to increase, requiring long-term planning and responses to reduce risks, especially for coastal cities and populations.