One consequence of global warming is an increase in both ocean evaporation into the atmosphere, and the amount of water vapor the atmosphere can hold. (ucsusa.org)
Any tiny amount of logarithmic CO2 forcing is mostly offset by the added cloud cover / increased albedo caused by increased ocean evaporation. (wattsupwiththat.com)
... the approximate rate of washout of carbon dioxide from the Earth's atmosphere via rainwater can be determined from the known ocean evaporation rate and from the known solubility of CO2 in distilled water as a function of temperature and CO2 partial pressure. (drtimball.com)