growing number of would-be geoengineers who advocate high-risk, large-scale technical interventions that would fundamentally change the oceans and skies in order to reduce the effects of global warming. In addition to George’s scheme to fertilize the ocean with iron, other geoengineering strategies under consideration include pumping sulfate aerosols into the upper atmosphere to imitate the cooling effects of a major volcanic eruption and “brightening” clouds so they reflect more of the sun’s rays back to space. The risks are huge. Ocean fertilization could trigger dead zones and toxic tides.
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