At low altitudes they help to cool the Earth by reflecting sunlight away from it.At the high altitudes studied by AIM and TC4, however, they trap radiant heat from below, warming things up.

• 低端云层能够通过反射阳光而给地球降温，而AIM卫星与TC4工程研究的高端云层却将反射回去的热量阻挡，这样地球也随之升温。