Recent studies on the rate at which sea level is rising due to warmer ocean water and melting ice sheets show that not only is sea level rising in most areas, but the rate at which it is rising is increasing.  This has important implications for coastal communities, which often do planning based on the assumption that the rate of rise will be constant over time.  What it means is that low-lying areas may become inundated sooner than currently expected.  Here are a couple of articles which discuss these changes.

Washington Post: Sea level rise isn’t just happening, it’s getting faster

Business Insider: The rate of sea level rise increased 50% in the last two decades, new study finds

Miami Beach skyline. Source: Ethically Yours, Commons Wikimedia