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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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President Donald J. Trump has announced that the United States will withdraw from the Paris Agreement, the accord forged by the United Nations Framework Convention on Climate Change (UNFCCC) in 2015, with its 195 signatory countries pledging to cut carbon emissions in a effort to limit global warming to no more than 2ºC above pre-industrial levels. Trump says that he plans to halt payments into the Green Climate Fund, and re-negotiate the United States’ place in the agreement, claiming that the deal, as it stands, was specifically made to disadvantage the American economy.
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A new study has been published that has found that the rate of sea level rise is much worse than previously thought, having tripled in pace since 1990. Before 1990, the oceans were rising at an average rate of 11 millimeters (0.43 inches) per decade, but between 1993 and 2012, that rate increased to 31 millimeters (1.22 inches) per decade.

"We have a much stronger acceleration in sea level rise than formerly thought," explains study lead Sönke Dangendorf, with Germany’s University of Siegen. "The sea level rise is now three times as fast as before 1990."
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