Whales' role in carbon capture

A recent analysis by the International Monetary Fund (IMF) highlights that large whales may significantly slow global warming by capturing carbon, challenging the common focus on reforestation as the primary natural solution.

Carbon storage in whale bodies

According to the IMF, a single large whale captures as much carbon as 2000 birch trees. This is due to the whale’s body, which stores CO2 throughout its life and sequesters it for centuries after the whale dies and sinks to the ocean floor.

Whale excrement and phytoplankton

Whale excrement, rich in iron and nitrogen, fertilizes phytoplankton, a marine organism that produces a large part of the Earth’s oxygen and captures CO2 on a large scale, further enhancing their role in carbon capture.

Challenging conventional climate solutions

The IMF's findings challenge the conventional image of natural climate solutions, which typically involve dense, green forests. This analysis highlights the role of marine mammals in the carbon cycle, a topic long overshadowed by climate policies.

Blue carbon pump and long-term storage

When a whale dies and sinks to the bottom of the ocean, the carbon stored in its body is sequestered for hundreds or even thousands of years, a process known as the blue carbon pump. This long-term storage removes carbon from the atmosphere effectively.

Whales and reforestation: complementary solutions

While the idea of whales playing a major role in climate regulation may seem surprising, the numbers suggest that reforestation campaigns may not be as effective as protecting well-protected whales. However, this does not mean reforestation should be abandoned, as forests provide essential local and terrestrial benefits.

Protecting whales requires global action

Protecting whales involves reducing ship collisions by adapting maritime routes, limiting underwater noise pollution, combating illegal fishing, and preserving breeding and feeding areas. These actions require international cooperation and policy changes.

Marine solutions deserve attention

This IMF report emphasizes that no single solution can address climate change, but a combination of strategies is necessary. Oceans, covering more than 70% of the Earth’s surface, remain underutilized in climate strategies, and their potential should not be ignored.