As night fell over the northeastern Italian city of Venice on November 12, 2019, sirens wailed, signaling the arrival of a particularly high tide. At more than four feet above sea level, the city’s forecasting institute classed the tide as “exceptional,” but residents were prepared with electric pumps and steel barriers slotted into ground-floor doorways. As the night wore on, though, the tide rose far higher. Fierce winds and rain drove the water into the historic city, creating waves in St. Mark’s Square. At St. Mark’s Basilica, Venice’s iconic Byzantine…
