The downward radiation to the surface increases mainly because the low level air temperature increases, not because of the direct effect of increased CO2 in the air. (realclimate.org)
So what is the net effect of the increase in CO2 in the atmosphere? (wattsupwiththat.com)
Recent, rapid climate change is driving evolution, as organisms adapt to altered seasonal events rather than to the direct effects of increasing temperature. (science.sciencemag.org)