I couldn’t agree more! That aside, let’s look at the mechanics of such a concept: the Earth revolves around the sun, therefore it seems to me that the giant parasol would have to move as well to keep it in position. Have they even tried to work out the logistics of THAT? I don’t think so.
A worthless remedy for a nonexistent problem.
It’s called Lagrange points. Look it up. Basically a device like this sunshade placed at a Lagrange point will maintain a constant position relative to the earth and sun at all times as the earth orbits the sun. There are issues with this idea, but maintaining the position of the shade would not be one of them. Gravity will take care of it.