Clouds are present in the troposphere . So the radiation from the Sun first needs to pass this layer of the atmosphere to come down which means that the clouds above are constantly being radiated from the Sun in daytime with higher intensity than what reaches down the earth but if that's true why don't the clouds gradually evaporate and just never condense to form clouds again (because of higher radiation intensity as we go above the Earth's surface).
What exactly makes clouds stable as a large lump even if they are constantly being radiated at higher intensity of sunlight from above ?
As per Joseph's answer , the infrared back from the Earth heats the atmosphere. But Wikipedia says that . So if it's true then why don't the vapours above absorb the infrared from the Sun directly without letting it pass through in the first place ?
Why aren't the clouds affected by infrared from Sun if they are affected by infrared from Earth ?