Distinct isotopes of combustion-derived water vapor identified

Water vapor (H2Ov) is an essential component of Earth's atmosphere, playing critical roles in climate regulation, weather patterns, and the water cycle. Its sources primarily come from natural processes such as ocean evaporation and terrestrial evapotranspiration. However, during the fossil fuels (e.g., coal, petroleum, natural gas) combustion process, in addition to emitting substantial amounts of CO2, they also generate significant amounts of water vapor as a byproduct (combustion-derived water vapor sources: CDWV).