It's serious <a href=" http://ilcufoundation.ie/stendra-in-farmacia.pptx ">stendra rxlist</a> If there is enough water vapor in the atmosphere, all surface radiation will be absorbed and none will escape back into space. According to Goldblatt, it turns out that once sufficient water vapor exists, there is a determinate amount of radiation that can be emitted to space. When the amount of incoming sunlight exceeds this fixed limit, you get a runaway greenhouse effect.