The new study found the rate of old carbon released during the past 60 years to be relatively small. (sciencedaily.com)
It pumps million - year - old carbon from inside the earth into the atmosphere, where the concentration of carbon dioxide is increasing. (woodheat.org)
But the measurements to date have not shown whether the carbon emitted was greater than carbon absorbed, or how old the carbon emitted was. (scholarsandrogues.com)