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Great whales are the carbon-capture titans of the animal world, absorbing an average of 33 tons of CO2 each throughout their lives before their carcasses sink to the bottom of the ocean and remain there for centuries. A tree, by contrast, absorbs no more than 48 pounds of the gas a year.

Whales also support the production of phytoplankton, which contributes at least 50% of all oxygen to the Earth’s atmosphere and captures as much CO2 as 1.7 trillion trees, or four Amazon forests.

Increasing phytoplankton productivity by just 1% would have the same effect as the sudden appearance of 2 billion mature trees, according to the study.

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