| Summary: | Different forms of geoengineering have been proposed: spraying sulfates into the upper atmosphere to block a portion of sunlight, fertilizing the ocean with iron to spark carbon-gobbling algal blooms, or covering sea ice with bags of silicon beads to slow its melting. The idea is controversial, to say the least, but, as a new report shows, geoengineering is edging away from the margins and toward the center of discussions about climate change. The polarized debate surrounding geoengineering exemplifies the difficulties of talking about, much less solving, the problem of climate change, an issue where ethical, scientific, and political questions overlap, blend together, and sometimes obscure one another.
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