Toxic levels of carbon dioxide: at levels above 5%, concentration CO2 is directly toxic. [At lower levels we may be seeing effects of a reduction in the relative amount of oxygen rather than direct toxicity of CO2.]
And when the CO2 hits about 7% to 10% of your ambient air, you DO die. Even if the rest is O2. It's CO2 narcosis, and it shuts you down.
As soon as the snow melts at the Valley, a great number of mice rush there and die after inhaling the poisonous substance. Dead mice attract foxes that also die poisoned by hydrogen sulfide. The smell of dead foxes like a magnet attracts bears and gluttons - the fate of these animals is easy to predict. However, that is not all: Steller`s sea eagles notice dead bear bodies descent to the Valley in search of food and stay there forever.
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