Warmists freak out about carbon dioxide. They call it a pollutant and demand that it all be kept in the ground. They call it the cause of global warming I mean climate change and ignore its vital role in the hydroshpere.
Water vapor is a greenhouse gas in that it causes warmth by absorbing radiation mainly in the 18 to 30 micrometer band, allowing most of the rest to escape into space. But CO2 absorbs radiation in a different range: 8 to 18 micrometers. CO2 absorbs infrared radiation that water vapor would allow to pass through the atmosphere and into outer space. Radiation absorption causes warmth. Increasing levels of CO2 in the atmosphere means more radiation absorption, and therefore increased warmth. CO2 is a greenhouse gas: