To call what's happening in the oceans right now an anomaly is a bit of an understatement.Since March, average sea surface temperatures have been climbing to record highs, as shown in the dark line in the graph below.Since this record-keeping began in the early 1980s-the other squiggly lines are previous years-the global average for the world's ocean surfaces has oscillated seasonally between 19.7° and 21° Celsius (67.5° and 69.8° Fahrenheit).
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