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Case for significant anthropogenic forcing remains unclear *
The case for significant anthropogenic forcing of the climate remains unclear. (#5041)
Water vapour impact far outweighs impact of CO2 *
Water vapour is the most significant greenhouse gas, accounting for around 98% of the Earth's natural greenhouse warming effect. So changes in carbon dioxide or methane concentrations will have a relatively small impact. (#14797)
Long-term accumulation of trace gases in atmosphere
Trace greenhouse gases such as CO2 stay in the atmosphere on a timescale of decades to centuries—whereas water vapour is essentially in balance with the Earth's temperature on annual timescales and longer. (#14799)
Significance of water vapour effect is overstated
The statement that water vapour is "98% of the greenhouse effect" is simply false. In fact, it does about 50% of the work; clouds add another 25%, with CO2 and the other greenhouse gases contributing the remaining quarter. (#14798)
Water vapour effect already included in climate models
The water vapour feedback loop is already taken into account in the climate change models. (#14800)
Water vapour has a very short atmospheric half- life compared to CO2
(#63032)
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