You’re thinking in absolute terms which is the problem in understanding it. Imagine you have a surface that reflected a unit X of heat back to its source. Now

You’re thinking in absolute terms which is the problem in understanding it. Imagine you have a surface that reflected a unit X of heat back to its source. Now it does 2X. In the next few decades it’s going to do 3X. Does it make sense now? That X was enough to keep us warm. Now we’re facing with that amount increasing significantly.