Study shows increase of CO2 in the atmosphere is lower than predicted because of plants
A team of researchers in the U.S. claims that climate models used to predict the rise in CO2 concentrations in the atmosphere are approximately 17 percent too high because they incorrectly approximate how much CO2 plants pull from the atmosphere. In their paper published in Proceedings of the National Academy of Sciences, the team describes how they studied the ability of plants to absorb increased amounts of CO2 and discovered that they are capable of pulling more out of the atmosphere than has been previously thought and the difference is approximately equal to the error difference reported by simulation models.
http://phys.org/news/2014-10-co2-atmosphere.html