Warming due to carbon dioxide jumped by half in 25 years

<> Warming due to carbon dioxide jumped by half in 25 years - 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. NOAA's Annual Greenhouse Gas Index