Helen heleN.A.walter-Terrinoni@outlo, Organization Not Listed, Washington, DC, United States, Stephen A Montzka, NOAA/ESRL Global Monitoring Division, Boulder, CO, United States, Christina Theodoridi, Natural Resources Defense Council, Washington DC, United States, Helen Tope, Energy International Australia, Melbourne, Australia and Jose Pons, Sicamu Inc, QUincy, FL, United States