The concentration of carbon dioxide — the most important long-lived global warming pollutant — in 2013 rose by the largest amount in 30 years, according to a new U.N. report. This news comes as more than 100 heads of state prepare to meet in New York on Sept. 23 for a one-day climate summit to catalyze action to reduce global warming. The report, known as the annual Greenhouse Gas Bulletin, shows yet again that the world is headed for a far warmer future with more acidic and inhospitable oceans, as the cumulative amount of carbon dioxide continues to climb. http://on.mash.to/1wd0gxj http://bit.ly/1fJ5yqZ
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