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Whales support the ocean's carbon-sequestering capacity by acting as a 'phytoplankton multiplier'. Through the 'whale pump' (vertical movement of minerals) and the release of nutrient-rich waste containing iron, phosphorus, and nitrogen, whales fertilize marine ecosystems. This supports phytoplankton, which capture approximately 37 billion metric tons of carbon dioxide and produce at least 50% of the atmosphere's oxygen. Despite a ban on commercial whaling, whale populations remain significantly lower than pre-commercial levels, with six of the 13 great whale species listed as endangered or vulnerable due to threats like ship strikes, plastic pollution, and climate change.