I can't wait until they makes these no cost, low-maintenance, and self-replacing. Oh man, just think of how easy it would be to fix our climate issues!
That energy can come from somewhere that doesn't produce more carbon than these kinds of machine sequester. Solar, wind, nuclear. Obviously we need to stop burning fossil fuels, but also we need to turn the carbon we've already produced back into a form that won't find its way back into the air.