Removal of carbon dioxide from air

A method for enhancing contact between a trace gas in a gas stream and a fluid sorbent solution which comprises creating fluid sorbent covered surfaces in an open and/or reticulated cell foam and flowing the gas stream along through-channels past the foam, wherein the cell foam is filled predominantly with gas and wherein at least some of the gas volumes inside the cell foam are interconnected with each other and are connected to the gas flow in the through-channels passing through the foam, and wherein the flow of the gas stream is varied over time, thereby enhancing the transport of sorbate gas into the foam structure.