JUST SO STUPID IT MIGHT WORK?

     With all the talk about Global Warming, I find myself thinking back to the old simulation game by Maxis called "SimEarth". Two of the eight scenarios in the game had you terraforming the planets Venus and Mars.

     Venus and Mars have their own problems for terraforming: Venus is too hot and has an extremely dense atmosphere compared to Earth. Its surface temperature averages 900°F and the atmosphere exerts ninety times the pressure at the surface than does Earth. Its atmospheric pressure is roughly the equivalent of being about a half mile underwater and breezes would feel more like rushing water than air against your body (we are working on the assumption that you would not immediately die upon exposure to this of course!).
     Mars has the opposite problem: it is too cold and it possesses a rarified atmosphere compared to Earth. Its average surface temperature is -67°F (whereas for Earth, the average surface temperature is about 60°F) and the atmospheric pressure at the surface is about 1/100th that of Earth's.

     The means for terraforming these worlds were objects called "oxygenators" (for converting CO₂ into O₂ and thus creating a cooling effect), "vaporators" (for releasing H₂0 into the air to moisten the world and raise the overall temperature), "N₂ generators" (to release inert nitrogen into the atmosphere in order to build up atmospheric pressure), and "CO₂ generators" (to release carbon dioxide into the atmosphere and thus warming the planet).
      What had me wondering was, "Were these carbon dioxide and oxygen generators entirely fictional?" Plants and animals do it all the time via photosynthesis and respiration so it can't be impossible. The question is can it be done effectively? That is, without further warming the planet?

      Now I'm thinking for Earth and its recent accumulations of carbon dioxide and methane which accelerate global warming trends. Could machines or more precisely, factories, be created all over the world (I'm assuming in desert climes where there's ample sunlight to power these factories and few people to interfere with their operations) to draw these greenhouse gases out of the atmosphere and replace them with oxygen and water? And could the carbon resulting from this be converted into bicarbonate rock (the stuff of seashells)? And could they draw out the "bad" gases faster than we can generate them?

      If powered by solar, nuclear, or wind energy, they would not create greenhouse gases themselves. It sounds ridiculous, but I wonder...