Smoke shrouding a bridge in Seattle, Washington, October 2022
Matt Mills McKnight / Reuters

“Geoengineering” can mean a number of things, but it usually refers to the attempt to offset the rising global temperatures that result from the greenhouse effect by introducing particles in a systematic and sustained way into the earth’s atmosphere so that it better reflects the sun’s rays. Although the idea sounds futuristic, the basic concept has been around for a long time. In 1965, a group of scientific advisers to U.S. President Lyndon Johnson suggested that some kind of tinkering with the planet’s mechanics might be necessary. “The climatic changes that may be produced by the increased [

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