Treating the symptoms, no matter how clever, isn't going to cure the disease. But it might give us enough time to actually get to the cure.

I always wondered how large a satellite we would need at the ideal spot between the earth and the sun to block a portion of the sunlight in order to cool the planet down a few degrees.

Not that it would solve humans being a cancer to the planet, but it would give us a few hundred years to get to a solution before billions of us find ourselves in some sort of post-apocalyptic world.