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I often wonder about fixing the carbon the atmosphere of Venus.

Whilst there is no water meaning this is unlikely to be possible using biological means, is it possible that some kind of machine could do this?.

The answer to this question doesn't rule out carbon fixing without water, but does suggest it is beyond our current capability.

Suppose that fixing is possible by some kind of floating machine in the upper atmosphere, energy should not be a problem, sunlight and wind should be plentiful.

Further suppose that the machine fixes the carbon into hollow shapes, essentially carbon balloons. With enough machines operating over a long enough time period, probably a geological era even with self replicating machines, what would be the effect on the Venusian atmosphere?.

I like to imagine Venus being blanketed with these carbon balloons, they could even be made in shapes that naturally interlock to create a kind of surface high above the real surface.

What would be the effect of such a blanket 20cm thick?, I often speculate that the temperature underneath the blanket would plummet, perhaps causing the CO2 to liquify, further reducing the atmospheric pressure at the (real) surface.

With the atmospheric pressure and temperatures reduced, would we see renewed volcanic activity?, would Venus expand noticeably?.

How would such a scenario be likely to end?, would the carbon blanket be weathered away or turned back into CO2 some other way?.

Putting aside the scale of such a venture, how feasible is any of this?.