According to Goodell, the most promising way to solve the global warming problem is______.

Jeff Goodell thinks geoengineering is a somewhat crazy idea. But he writes in his book that after the failure of last year’ s Climate Change Conference in Copenhagen, the technological approach may end up being the world’s only option.
    He says there are two ways geoengineering might solve the global wanning problem: One would be to use technology to remove carbon from the atmosphere; the other would be to block sunlight. Goodell says the latter idea offers the most promise. It would basically involve technologies that mimic what large volcanic eruptions do, put into the stratosphere particles that reflect sunlight back into space.
    Most environmentalists are appalled by such proposals to play with nature, but Goodell says humankind is already manipulating the climate, but not in a rational or beneficial manner.
    In How to Cool the Planet, Goodell examines some of the ideas proposed by scientists who are researching geoengineering. He says it is only a matter of time before someone tries to do it.
    But what worries many experts, and Goodell as well, is that some nation or individual might try to solve the global warming problem with a technology that only makes matters worse.
    Goodell says scientists exploring technological solutions to global wanning have, for the most part, done so quietly, for fear of drawing criticism from environmentalists opposed to the idea. Many of them are also worried about the risks involved. But Goodell says the time has come for an open discussion with other scientists, environmentalists, human rights groups and governments to at least promote the study of more options.