1,2-Dichlorohexafluoro-cyclobutane (1,2-c-C<sub>4</sub>F<sub>6</sub>Cl<sub>2</sub>, R-316c) a Potent Ozone Depleting Substance and Greenhouse Gas: Atmospheric Loss Processes, Lifetimes, and Ozone Depletion and Global Warming Potentials for the (E) and (Z) Stereoisomers