They have propsed a completely unproven attempt to alter the planet using a technique involving spraying large amounts of sulfate particles into the Earth’s lower stratosphere...
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If a private company did that it would be fined for air pollution.
Dr. Teller, I think it was, wrote an article a couple of decades back arguing that the climate change guys were overly hysterical, and that there were a number of mitigation strategies that were far cheaper than the anti-carbon route. His suggestions for possible cheap solutions included this one.
Here’s a reference: https://www.wired.com/2008/06/ff-geoengineering/
“Geoengineering schemes sound like they’re pulled straight from pulp sci-fi novels: Fertilize the oceans with iron in order to sequester carbon dioxide; launch fleets of ships to whip up sea spray and enhance the solar reflectivity of marine stratocumulus clouds; use trillions of tiny spacecraft to form a sunshade a million miles from Earth in perfect solar orbit. They all may seem impractical, but among a small but growing set of climate scientists, one idea that Wood and Teller started pushing in the late 1990s (before Teller’s death in 2003) is gaining acceptance: Inject sulfur dioxide into the stratosphere to reflect a portion of the sun’s rays back into space, thus cooling the planet.”