visibility is a couple kilometers
First, thanks for your very interesting posts. Do you mean visibility at ground level or at the altitude where the pressure is 1atm ? If the former, then why did the Russian probes only show pictures with about one meter of visibility ?
Personally I really liked the idea put forward at the end of K.S.R.'s Blue Mars: put a gigantic thin (monomolecular) film at L1 between Venus and the sun to lower the solar input and let Venus atmosphere condense to the ground.