Human blood chemistry is being impacted by the rise in atmospheric carbon dioxide.
And this quote is concerning: “If current trends continue, modelling indicates average bicarbonate levels could approach the upper limit of today’s accepted healthy range within 50 years.” Note that bicarbonate levels are a proxy/indicator for CO₂ levels. Source: https://phys.org/news/2026-02-carbon-dioxide-human-blood.html
It’s not quite clear yet what the implications for human health are, but the effect will be higher in those exposed to these higher levels for more of their lifespan.