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The levels of carbon dioxide found in the atmosphere in modern times have been found to be nearly ten times higher than any other time since the extinction of the dinosaurs, 65 million years ago. The event that came the closest to today’s CO2 levels, the Paleocene-Eocene Thermal Maximum (PETM), occurred 55.5 million years ago, where a spike in greenhouse gasses caused global temperatures to increase by 5–8 °C over what we’re experiencing today. While the existence and cause of the PETM is well established, the source of the massive amount of CO2 that caused the temperature spike has been a complete mystery to scientists.read more

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Republican presidential candidate Donald Trump has appointed long-time climate change denier Myron Ebell as his new head of Trump’s Environmental Protection Agency (EPA) transition, provided Trump is elected this fall. Ebell is well known as a global warming denier, with the Financial Times calling him “one of America’s most prominent climate change skeptics”, and would be expected to carry many of out Trump’s plans to undo years of ecological protection policy, including the elimination of the EPA’s Clean Power Plan.
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A new study that employs global positioning system measurements has revealed that the Greenland ice sheet is melting much faster than what previous estimates indicated, by roughly 7.6 percent. Previous estimates pegged the amount of ice loss between 2003 and 2013 at 2,500 billion tons, but the new study corrects this to 2,700 billion tons — a major factor in estimating the rate of future sea level rise.
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Despite a cool, cloudy summer, the ice levels in the Arctic have shrunk enough to tie with the second-lowest Arctic sea ice minimum, recorded in 2007. "Historically such weather conditions slow down the summer ice loss, but we still got down to essentially a tie for second lowest on the satellite record," reports US National Snow and Ice Data Center (NSIDC) director Mark Serreze.
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