Now imagine this: if we could do this, we could just as well put a shade in front of Venus. We could cool Venus as much as we want, in particular we could cool

Now imagine this: if we could do this, we could just as well put a shade in front of Venus. We could cool Venus as much as we want, in particular we could cool it to below the freezing temperature of CO2. All the CO2 in the atmosphere would fall to the surface. The pressure would decrease from the current 93 bar to very nearly 1 bar (the pressure on Earth). A factor of 3.5 comes from the lowering of the temperature (from about 700K to 200K) and another factor of 30 from the disappearance of the CO2, which currently represents 96.5% of the Venusian atmosphere How long would it take for this to happen? Most likely just a few years. But how do you make Venus habitable? If you let more light come through, the temperature goes up, but so does the CO2. You need to first sequester the CO2. We would need to plant trees on Venus. Initially, we'll put them in some greenhouses. Besides CO2, trees need water and oxygen, but not a lot of oxygen, because once they get started, they create oxygen from CO2. As for water, there's very little of it on Venus, but there's plenty of clouds of sulfuric acid, from which we could make water. After that trees would need nitrogen, and Venus has plenty. Also potassium and phosphorus. I'm not sure if they'd be easy to source.