Off-topic but I really need a clarification on that: I was told that we have already switched from a situtation where the most alarming greenhouse effect gas in the atmosphere was CO2, to a situation where the atmosphere is hot enough to hold much more H2O (as water vapour), making it the (vastly) most dangerous greenhouse effect gas. So the greenhouse effect is now self-inducting itself mainly via H2O. Anyone is aware of that, and can comment?