How about a space mirror? This seems like a better alternative than to blanket the sky with aerosols.
We must stop dumping carbon into the atmosphere. We need a Manhattan project for clean energy and over all efficiency. We will also have to change the way we live and perform operations on the planet. (No one want to hear this.) We could use this crisis as an inspiration for building a better life for all and more hopeful future. (Yeah, I like Star Trek.)
Gene Roddenberry - "In the 24th century there will be no hunger, there will be no greed, and all the children will know how to read."