The White House cautiously endorsed 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.
In fact, it very well might be. I recall reading about a study done a year or two back that concluded that a fleet of high-altitude aircraft injecting calcium carbonate particulates into the stratosphere could counteract anthropogenic climate change for a cost of about $2 billion per year.