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A Delaware-sized portion of Antarctica’s forth-largest ice shelf calved off, sometime between July 10th and 12th, following the rapid propagation of a 127 kilometer (79 mile) long crack running through the sheet. The resulting iceberg is over 200 meters (656 feet) thick, and covers roughly 6,000 square kilometers (Delaware itself is only 5,130 square kilometers (1,982 square miles). This will likely place it as the third-largest known iceberg in modern history.
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A new study published in the journal Nature has illustrated that the global rise in sea levels is worse than originally anticipated, and the rate of increase is accelerating. Between 1993 and 2014, the rate of increase jumped by 50 percent, with the average rise in 1993 being 2.2 millimeters (0.87 inches), and 2014 showing a rise of 3.3 millimeters (0.13 inches). This study follows an earlier paper that found that sea level increases are now nearly triple that of their pre-1990 levels.
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Amongst the myriad secrets lost to the ancient world was the formula for Roman concrete: uncannily more robust than today’s mixtures, there are ancient Roman seawalls and harbor piers, built two millennia ago, that are still standing today, whereas modern concrete would require maintenance every few decades under the same aquatic conditions. But now, a new study may have uncovered how the ancients made their long-lasting concrete, suggesting that the secret of this forgotten formula may not truly be set in stone.
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