Rising carbon dioxide in the atmosphere may be leaving a measurable imprint inside the human body. Researchers analyzing more than two decades of U.S. health data found that blood bicarbonate levels have climbed about 7% since 1999, while calcium and phosphorus have declined—changes that closely track increasing atmospheric CO2.
Too much carbon dioxide vs oxygen in the air. Your body cannot power itself and unless you find a supplemental source of oxygen, you asphyxiate in the destroyed atmosphere.
Like trying to breathe on Mars.