From a story on politico.com by Corbin Hiar headlined “White House cautiously opens the door to study blocking sun’s rays to slow global warming”:

The White House offered measured support for the idea of studying how to block sunlight from hitting Earth’s surface as a way to limit global warming, in a congressionally mandated report that could help bring efforts once confined to science fiction into the realm of legitimate debate.

The controversial concept known as solar radiation modification is a potentially effective response to fighting climate change, but one that could have unknown side effects stemming from altering the chemical makeup of the atmosphere, some scientists say.