Physorg: A milestone was reached last Friday as scientists determined that concentrations of carbon dioxide nudged up to 400 parts per million.
But CO2 is not the only gas needing baseline measurements, according to Dr. Jeffrey S. Gaffney, chair of the chemistry department at the University of Arkansas at Little Rock. Gaffney is internationally respected for his research in environmental and atmospheric chemistry.
"We know that there are higher ethene levels over certain regions, including the southeastern...