The HAO Geospace section conducted global simulations of temperature change due to emissions of trace gases, that extended from the surface, throughout the atmosphere, to space. These simulations were done under conditions of high solar activity, in order to compare the effect of the solar cycle on global change to previous work using low solar activity.The Whole Atmosphere Community Climate Model–eXtended was employed in this study. Lower atmosphere warming, due to increasing emissions of greenhouse gases, is accompanied by upper atmosphere cooling, starting in the lower stratosphere, and becoming dramatic, almost 2 K per decade on average, above 100 km altitude. This upper atmosphere cooling, and consequent reduction in density, is less than the almost 3 K per decade for low solar activity conditions calculated in previous simulations. This dependence of global change on solar activity is due to solar-driven increases in other gases other that cool the thermosphere, so greenhouse gases such as carbon dioxide have less effect. An ancillary result of these and previous simulations is an estimate of the solar cycle effect on temperatures as a function of altitude. There were too few ensemble members to identify significant solar cycle effects in the lower atmosphere, but at higher altitudes, temperature change from solar minimum to maximum increased from near-zero at about 15 km, to approximately 1 K at about 50 km, to approximately 500 K at about 400 km, commensurate with observations and with previous modeling studies.