An inside tour of the incredibleand probably dangerousplans to counteract the effects of climate change through experiments that range from the plausible to the fantasticDavid Battisti had arrived in Cambridge expecting a bloodbath. So had many of the other scientists who had joined him for an invitation-only workshop on climate science in 2007, with geoengineering at the top of the agenda. We can't take deliberately altering the atmosphere seriously, he thought, because theres no way we'll ever know enough to control it. But by the second day, with bad climate news piling on bad climate news, he was having second thoughts. When the scientists voted in a straw poll on whether to support geoengineering research, Battisti, filled with fear about the future, voted in favor.While the pernicious effects of global warming are clear, efforts to reduce the carbon emissions that cause it have fallen far short of whats needed. Some scientists have started exploring more direct and radical ways to cool the planet, such as:Pouring reflective pollution into the upper atmosphereMaking clouds brighterGrowing enormous blooms of algae in the oceanSchemes that were science fiction just a few years ago have become earnest plans being studied by alarmed scientists, determined to avoid a climate catastrophe. In Hack the Planet, Science

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