In light of the difficulties in achieving emission control, serious consequences of "business as usual" (Fig. 2) and urgency of approaching climatic ‘tipping point’, SRM seems to be the only feasible option mitigating global warming in a short time (Fig. 3), but the uncertainty of basic mechanism and potential impacts of SRM are so huge, that we absolutely can’t do any experiment on our real planet, instead we use computer modeling as our only way to improve our understanding of geoengineering.