The Intergovernmental Panel on Climate Change (2007 IPCC Report) determine: “Water vapor is the most abundant and important greenhouse gas in the atmosphere. However, human activities have only a small direct influence on the amount of atmospheric water vapor.”
IPCC is ignorant and wrong on the influence of human. Since industrialization human activities churn and turn the sea surface layer down to a dozen and more meters (Fig.1). Several hundred thousand ship propellers, and million other activities exchange warmer with colder water, or vice vers, and modify the salinity structure. That is the gate by which the amount of vapor is generated.
These ocean uses affect the part of the ocean that is the major weather maker up to several weeks if not many months. The state of the upper 50 to 200 meters sea surface layer govern climate up to several years. The weather making mechanism is water vapor, and that is controlled by the state of the oceans. In comparison CO2 is just 0.04% of the total atmospheric gases (Fig.2). Whether it has a significant role depends also foremost on the conditions of the sea and its generating impact on vapor. IPCC’s ignorance disguise politics and the general public from addressing the climate change issue properly, while the skeptic community fails to challenge IPCC in this respect, as can be seen in a post at WUWT. The link concludes:
However, as Aldous Huxley said, “Facts do not cease to exist because they are ignored.”