The consequences of CO2 levels rising above 15, specifically in the context of carbon dioxide concentration in the air measured in thousands of parts per million (ppm), would most closely align with:
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Critical judgment impairments - High levels of CO2 can affect cognitive functions, leading to impaired decision-making and judgment.
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Increased oxygen demand - Elevated CO2 levels can stimulate increased breathing rates to expel the excess carbon dioxide, leading to a higher oxygen demand in the body.
Immediate death and toxic air causing unconsciousness would typically require much higher concentrations of CO2, generally above 40,000 ppm, which is not commonly encountered in normal environments.
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