The core question isn't whether geoengineering could cool things. It's who controls the thermostat. Define terms: deliberate, large-scale climate modification. My test is safety, reversibility, and fairness. Solar geoengineering fails all three. If one country sprays, monsoons shift elsewhere, and no institution can fairly set a global temperature. Stop, and warming rebounds fast. My opponent says research and govern carefully. But there's no owner and no off switch. Carbon removal is safer but slow, pricey, and still distracts from cutting emissions. So a temporary, unequal fix that can trigger famine isn't a tool. It's a gamble.