… lies asphyxia, hallucinations, brain-damage and death.
Depending on where you are on the planet, cirrocumulus, cirrus, and cirrostratus clouds can form as high as 60,000 ft. At this height, atmospheric density is half that at sea level. Or, each breath contains roughly half the oxygen you’d be breathing at sea level. At sea level, oxygen level is 21%. At only 19%, a normal person has a decreased ability to work strenuously and impaired coordination. At 15%, respiration and pulse increases, coordination decreases further, and perception is impaired. At 12%, you have a further rate of increase in respiration and pulse, bluish lips, and poor judgement. At 10%, which is what you are effectively breathing at 60,000 ft, you have nausea, vomiting, mental failure, fainting, and in the weak, unconsciousness as you slowly asphyxiate and begin to hallucinate your way to brain damage, and, eventually, death.
Remember this next time one of those valley solution providers offers to take you beyond the clouds!