Extra Atmospheric CO2 Increased Red Spruce Forest Growth 106% Since 1989

By Dr. Craig Idso Writing as background for their study, Mathias and Thomas (2018) say that "tree ring growth and isotope chronologies have become important proxies used to examine historical changes in productivity, plant physiology, and ecosystem processes in a rapidly changing environment." In producing three such proxies of their own, the two researchers analyzed…

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