Bill Gates, who recently suggested the world should eat 100 percent synthetic beef and said bitcoin is bad for the planet, has set his sights on a new foe: the sun.
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Gates and other private donors are backing Harvard University’s Solar Geoengineering Research Program, which will soon launch a new study researching the efficacy of blocking sunlight from reaching Earth’s surface.
This week, the influential National Academies of Sciences, Engineering, and Medicine (NASEM) also released a new report urging the U.S. government to spend at least $100 million to study solar geoengineering, a controversial technology.
What is solar geoengineering, anyway, and why are scientists suddenly interested in—and concerned by—the concept?