Pinterest. Actually, it's pretty well accepted that water vapor is responsible for 98% of the normal greenhouse effect. 4 Answers. Values based on assessment report AR5. Yet the global warming potential (GWP) and radiative forcing (RF) of emitted water vapour have not been formally quantified in the literature. Global warming potential (GWP) values relative to CO 2. While water vapor may be the most dominant greenhouse gas by mass and volume, it certainly is not the primary culprit responsible for global warming. As other greenhouse gases such as CO2, warm the atmosphere, the air is able to hold more water vapor. Becoming all but impossible; With their northampton school students trekked; It's only fair to share... Facebook. What is the Global Warming Potential of water vapor? The IPCC tried to downplay the role of water vapor in affecting global temperatures by amplifying the role of CO2 and CH4. The range of numbers used to determine greenhouse effectiveness or Global Warming Potential (GWP) suggested people … Global warming arises from the interaction of sunlight with water to evaporate it and involves all the effects of the hydrologic cycle. Favorite Answer. Water vapour is the most abundant and powerful greenhouse gas in Earth's atmosphere, and is emitted by human activities. Rather it is part of an amplifying effect. Order. So if there's ~30 times more water vapor in the atmosphere, and it accounts for ~3 times more of the greenhouse effect, its global warming potential is … What about water? Methane < Nitrous Oxide < HFC-134a < CFC-11 < CF 4