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Rising sea levels are one of the most pressing consequences of climate change, and their impact on cities across the globe is likely to be profound. Here's a comprehensive look at why sea levels are rising and which cities are at greatest risk. Why Sea Levels are Rising: Global Warming: The Earth's average temperature is increasing due to the buildup of greenhouse gases, particularly carbon dioxide and methane, in the atmosphere. This leads to the thermal expansion of seawater—warmer water takes up more space than colder water. Melting Ice Sheets and Glaciers: Large ice masses, particularly in Greenland and Antarctica,…