(Bloomberg) — U.S. coastal cities are flooding more often, and we have no one to blame but ourselves. That's because two- thirds of floods since 1950, measured at 27 tidal gauges around the country, might not have spilled over without a push from manmade climate change, according to a new report by the research-and-news nonprofit Climate Central.

The study is based in part on a new scientific article, published simultaneously in the Proceedings of the National Academy of Sciences (PNAS), which shows that the current pace of global sea-level rise is faster than it's been in at least 3,000 years.

"Sea-level rise caused by humans is already tipping the balance for most coastal floods today," said Benjamin Strauss, a Climate Central vice president responsible for its rising-seas research, "and we're only inches into a problem that is going to grow by feet."

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