July 15, 2015

Depending on the data set, 2014 was either the warmest or tied-for-warmest year since records began in the mid-to-late 1800s.

July 15, 2015

In 2014, precipitation over land was generally below average, while precipitation over the oceans was above average.

July 15, 2015

Overall, average global river outflow in 2014 slightly exceeded the climate normal. 

July 15, 2015

Worldwide in 2014, three dozen reference glaciers experienced an average mass loss equivalent to of 853 millimeters of water equivalent in 2014.

July 15, 2015

Scientists estimated global average carbon dioxide concentration at 397.2 parts per million (ppm) in 2014, as the global growth rate of carbon dioxide continues to accelerate. 

Montzka in a snow pit in Antarctica
May 18, 2015

Some of the chemicals that replaced ozone-harming CFCs are long-lived greenhouse gases. At NOAA's lab in Boulder, Colorado, chemist Steve Montzka leads the effort to monitor the concentration of CFC-substitutes and their potential impact on global warming.

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