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It would be 100 times cheaper to shield the Earth from sunlight with a man-made "sun block" than to cut emissions of greenhouse gases.
Scientists have suggested that generating sulphate aerosols in the upper atmosphere, which are naturally emitted during a volcanic eruption, could quickly lower global temperatures, which happened after the eruption of Mount Pinatubo in the Philippines in 1991. Another possibility is to spray fine droplets of seawater into the air to create low-level clouds that would lower daytime temperatures over the oceans.