Exactly! But instead of one massive sunshade we would be better off using many small ones, which would allow us to control the local weather. Two possible techn

Exactly! But instead of one massive sunshade we would be better off using many small ones, which would allow us to control the local weather. Two possible technologies that seem promising to me are large nitrogen filled balloons with solar elements and several kilometer high solar updraft towers. The updraft tower depending on configuration can transport large amount of dust upwards helping to create clouds, or condensate the moisture in the air (which is particularly effective in arid regions near the sea). The balloon-solar plants would also help to reduce the temperature.