Time-dependent release scenarios for carbon dioxide and chlorofluoromethanes (CF2Cl2, CFCl3) are assumed. The combined effects on stratospheric ozone and temperature are examined with a time-dependent radiative-convective-photo-chemical model. A steady-state version of the model is used to determine surface temperature effects and to establish asymptotic levels. Results indicate the following: (1) the total ozone time history is significantly different from that due to the chlorofluoromethanes alone; (2) a local ozone minimum occurs in the upper stratosphere about 45 years from the present with a subsequent ozone increase, then decline; and (3) steady-state solutions indicate that tropospheric temperature and water vapor increases, associated with increased infrared opacity, cause significant changes in tropospheric ozone levels for 2¿CO2 and 4¿CO2 with and without the addition of chlorofluoromethanes.