Tropical rainforests, which cover only 6% of the Earth’s land surface, produce 40% of the Earth’s oxygen.
Numbers here vary, but, in reality, rainforests are responsible for supplying a small fraction of oxygen to the rest of the world. They are responsible for about 28% of the world’s oxygen turnover, which is sometimes inappropriately called production or supply. The vast majority of oxygen, about 80%, is actually supplied by algae in the ocean.
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