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June 13,2016

Human activity has increased the direct warming effect of carbon dioxide (CO2) in the atmosphere by 50 percent above pre-industrial levels during the past 25 years, according to NOAA's 10th Annual Greenhouse Gas Index .

In 2015, the global average CO2 concentration reached 399 parts per million, increasing by a record amount of almost 3 ppm. From the end of the Ice Age to the beginning of the industrial era, atmospheric carbon dioxide remained remarkably stable at 278 ppm.

"We're dialling up Earth's thermostat in a way that will lock more heat into the ocean and atmosphere for thousands of years," said Jim Butler, director of NOAA’s Global Monitoring Division.

   
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