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Stronger westerly winds in the Southern Ocean could be the cause of a sudden rise in atmospheric CO2 in a period of less than 100 years about 16,000 years ago, according to a study published in Nature Communications.

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Post-traumatic stress disorder (PTSD) may increase the long-term risk for stroke and heart attack in blue-collar clean-up crews who worked in the aftermath of The World Trade Center plane attack on September 11, 2001, according to new research in Circulation: Cardiovascular Quality and Outcomes, an American Heart Association journal.

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They exist all over the world, are among the most productive ecosystems on Earth and are home to a diverse array of wildlife. They also are essential to the global economy. They are estuaries — coastal embayments where fresh river water and salty ocean water meet.

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