The delay of anthropogenic climate change caused by oceans and other s
lowly reacting climate system components forces us to numerical modeli
ng as the basis of decisions. For three three-dimensional numerical ex
amples, namely transient coupled ocean-atmosphere models for the addit
ional greenhouse effect, internal ocean-atmosphere variability, and di
sturbance by soot particles from burning oil wells, the present-day st
atus is described. From all anthropogenic impacts on the radiative bal
ance, the contribution from trace gases is the most important.