Word: phytoplankton
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Dates: during 1980-1989
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...would be left in the Southern Hemisphere. And life would have difficulty renewing itself even after the dark and cold lifted, because most of the protective layer of ozone in the upper atmosphere would have been burned off. Killer ultraviolet radiation would stream in from the sun, paralyzing even phytoplankton, the one-celled ocean plants that form the base of the ocean's food chain. The effects would be less ghastly-but still catastrophic-if fewer megatons were exploded...