The oceans affect the climate in numerous ways, some of which are poorly understood and therefore cannot be accurately modeled in computer climate programs. A. Estimates of future conditions are entered into supercomputers to calculate climate possibilities at various places on earth. B. Oceans absorb a great deal of carbon dioxide from the air through limestone production and photosynthesis or phytoplankton. C. Gases are stored in the sea in the form of shells and hydrates, but gases stored in these ways can be recycled to the atmosphere where they may cause warming. D. The ocean's capacity to absorb carbon dioxide remains great despite recent reduction of marine plant nutrients such as iron. E. Ocean circulation is strongly controlled by wind and by the sea's balance or salt and heat. F. The ocean holds and moves a great deal of heat, and as water evaporates, it produces clouds, snow, and ice, which all affect global temperatures.