The same technology could be used to reduce gw on the earth:

1. an orbiting sunshade

2. putting something in the atmosphere that makes it more reflective, like sulfur dioxide

I wonder how big a sunshade would need to be to reduce temps by, say, one degree. A specific location could be shaded by putting the shade in geosynchronous orbit. To finance the sunshade, put a Starbucks or Coca-Cola logo on it.