Democratic presidential candidate Pete Buttigieg inaccurately said that “we could lose half the world’s oxygen because of what’s going on in the oceans.”

…Climate change does pose a threat to oceans, including by reducing the amount of dissolved oxygen in the water, which in some places could be cut in half. But globally, oceans are projected to lose only 1%-7% of their oxygen, and the world’s atmospheric oxygen supply is not at risk.

Buttigieg Wrong About Climate Change’s Effect on Oceans – FactCheck.org

hmmm