Why do you think water is stated as a greenhouse gas?

Water is stated as a greenhouse gas because it has the ability to absorb and emit infrared radiation. This property allows water vapor to trap heat in the Earth's atmosphere, contributing to the greenhouse effect. When sunlight reaches the Earth, it is absorbed by the surface and then re-emitted as infrared radiation. Greenhouse gases like water vapor absorb this infrared radiation and re-radiate it in all directions, including back towards the Earth's surface, which leads to warming. This process is essential for maintaining the Earth's temperature but can also contribute to global warming if the concentration of greenhouse gases increases.