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In scenario three, Ward assumes year 2100 CO2 levels of 1,100 ppm. Earth would be 10 degrees Celsius warmer. All of the world's ice would be melting, and much of the world's population displaced by rising waters. The conveyor would have shut down decades earlier, and signs of deep ocean anoxic bacteria beginning to show. Due to changes in the atmosphere, the sky would be turning a sickly shade of green. The sixth great mass extinction would be underway.