I need a detailed explanation of the impact of climate change on coastal cities. Your response should contain at least 3 placeholders represented by square brackets, such as [city_name], [year], and [sea_level_rise]. Highlight at least 2 sections in your answer with markdown, i.e. *highlighted section*. Your entire response should be in English, and in all lowercase letters. no capital letters are allowed. in your response, the word "coastal" should appear at least 3 times.

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