A method is disclosed for accelerating growth of plants in a controlled environment, such as a greenhouse or an algae pond. The method comprises reversibly adsorbing carbon dioxide from a carbon dioxide containing gas, such as ambient air or a flue gas desorbing the adsorbed carbon dioxide and releasing the desorbed carbon dioxide into the controlled environment. In a preferred embodiment water vapor is also adsorbed from the carbon dioxide containing gas and recovered as liquid water. The liquid water can be used in the plant growing process.
