Study Suggests Human Blood Could Be Pushed Past Its Healthy Limits Within 50 Years In A Nutshell A new analysis of U.S. blood test data from 1999 to 2020 found that average bicarbonate levels in the ...

CO2 levels are altering the chemical makeup of human blood over time, and may lead to health problems down the road. | Credit ...

Medically reviewed by Sanja Jelic, MD Key Takeaways Hypercapnia happens when you have too much carbon dioxide (CO2) in your blood.Symptoms of hypercapnia include dizziness, flushing, and shortness of ...

Humans evolved in an atmosphere containing roughly 200–300 parts per million (ppm) of carbon dioxide (CO₂). Today, that figure sits above 420 ppm, higher than at any point in the history of our ...