How much oxygen comes from the ocean?

At least half of Earth’s oxygen comes from the ocean. Source: https://earthsky.org/earth/how-much-oxygen-comes-from-ocean…

Save the giants, save the planet

Protecting large animals such as elephants and whales, and large plants like the sequoias, has a disproportionate positive impact on the health of the planet and resilience to climate change. Source: https://earthsky.org/human-world/why-to-conserve-large-animals-trees…