The scientists had whipped themselves into a frenzy. Gathered in a stuffy conference room in the bowels of a hotel in Berlin, scores of respected climate researchers, mostly middle-aged, mostly white, and mostly men, were arguing about a one-page document that had tentatively been christened the “Berlin Declaration.” It proposed ground rules for conducting experiments to explore how we might artificially cool the Earth—planet hacking, basically.
It’s most commonly called geoengineering. Think Bond-villain-caliber schemes but with better intentions. It’s a highly controversial field that studies ideas like launching high-flying jets to dust the skies with sulfur in order to block out a small fraction of the solar rays entering the atmosphere, or sending a fleet of drones across the ocean to spray seawater into clouds to make them brighter and thus reflect more sunlight.
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