The planet Venus is uninhabitable by earthly organisms due to its extremely high surface temperature (~450 C) and pressure (92 Bar). The high temperature is believed to be due to the high (96%) CO2 content of its atmosphere. At 55 km above the surface temperature and pressure are quite tolerable (27 C and 500 milliBar). You want to "Terraform" Venus by seeding its atmosphere with cyanobacteria which will metabolize the CO2 and generate O2, reducing the greenhouse effect, and thus lowering the surface temperature. Cyanobacteria can only survive Pco2 values up to 400 mm Hg. Supply calculations to show cyanobacteria can tolerate the Pco2 of the Venusian atmosphere at an altitude of 55 km.

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