It might work. But it's not a good idea.

 

While the world swelters (OK, the Northern Hemisphere, technically, but temperatures are above normal almost everywhere), this idea for blocking a bit of solar radiation came up. The administration says it's a legit idea -- and it is -- but the potential for unforeseen side effects is always there.  (Reference:  Snowpiercer.)

White House cautiously opens the door to study blocking sun’s rays to slow global warming

A Biden administration report required by Congress outlines research options for a last-ditch effort to slow the heating of the planet. But the White House says it’s not changing its climate strategy.

" “A program of research into the scientific and societal implications of solar radiation modification (SRM) would enable better-informed decisions about the potential risks and benefits of SRM as a component of climate policy, alongside the foundational elements of greenhouse gas emissions mitigation and adaptation,” the White House report said. “SRM offers the possibility of cooling the planet significantly on a timescale of a few years.”

Below is a bit more information.  We could always consider triggering a couple of volcanic eruptions;  that's a natural process, right?

"The 44-page document considers a few plausible ways to limit the amount of sunlight that hits Earth, all of which could have significant drawbacks. One method is to multiply the amount of aerosols in the stratosphere to reflect the sun’s rays away from the planet — a process that can occur naturally after a major volcanic eruption. Others include either increasing cloud cover over the oceans or reducing the amount of high-flying cirrus clouds, which reflect solar radiation back to Earth.

There are risks associated with each form of solar radiation modification, the report said, that can affect human health, biodiversity and geopolitics. That’s because modifying sunlight could alter global weather patterns, disrupt food supplies and lead to abrupt warming if the practice was widely deployed and then halted. It also wouldn’t address air pollution from fossil fuels or ocean acidification, a major threat to coral reefs’ ecosystems driven by the overabundance of carbon in the air and seas.

At the same time, the White House emphasized that it was important to compare those uncertainties with the present dangers associated with a hotter planet."

Link to the report.

The graphic below isn't from the report, but it does illustrate some of the ideas under consideration.