The model's YGP predictions for current atmospheric levels of carbon dioxide agreed reasonably well with the actual number of hurricanes seen in a typical year. (newscientist.com)
In addition, EPA will likely have to establish national ambient air quality standards (NAAQS) for greenhouse gases set below current atmospheric levels. (masterresource.org)
CO2 is a necessity of life itself since it makes possible green plants, the basis for animal life on Earth, and improves plant growth at current atmospheric levels (carlineconomics.com)