Rising CO₂ levels are reflected in human blood. Scientists don’t know what it means

By Alexander Larcombe, Associate Professor and Head of Respiratory Environmental Health, The Kids Research Institute Australia; Curtin University
Philip Bierwirth, Emeritus Research Associate, Australian National University

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 species.

We know this extra CO₂ is contributing to climate change, but could it also be changing the chemistry of our bodies?

In our recently published research we looked at two…

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