The more infrared light gets absorbed in the atmosphere, the less gets radiated back to space, causing the energy to be retained, hence the temperature rises. Water is more complicated because it dependes on whether the water vapor is invisible or in a visible form like a cloud. So it is impossible to say, without more study, whether adding water to the atmosphere will make it hotter by blocking infrared light or cooler by reflecting more of the Sun's energy away. You body temperature is about 300 degrees Kelvin. 10,000 nanometers is infrared light.
Rattlesnakes can sense infrared quite well with their tongues.
Humans can sense infrared light with the nerves in our skin but we can't make out shapes or judge distances this way. A light bulb radiates most strongly at a wavelength of about 3000 nanometers. Light is energy. So the ozone layer is hot because of the energy it absorbs. Explain why the sky is blue during the day.