Climate Change

How are whales, dolphins and porpoises affected by climate change?

Climate change is expected to be the main cause of mass extinctions in the 21st century and whales and dolphins are not immune. The rapid warming of the planet is leading to a loss of habitat for whales and dolphins and greater competition for a diminishing amount of prey species. It is affecting the timing and ranges of their migration, their distribution and even their ability to reproduce.

Climate change is a fundamental threat to whales, dolphins and porpoises.

Unless radical actions are taken, some whale and dolphin populations may not be able to adapt quickly enough to survive. For example, the northern Indian Ocean is fringed by land, limiting the ability of species to move northwards into cooler habitat as waters become warmer.

How do whales help combat climate change?

Whales play a key part in helping to combat climate change through their role in the marine ecosystem. They play a vital role in the health of the oceans where they help provide up to 50% of our oxygen, combat climate change and sustain fish stocks.

The way that whales feed, poo, migrate, and dive between the surface and the ocean depths (known as the ‘whale pump’), circulates essential nutrients throughout the ocean.  This in turn supports healthy marine ecosystems and the growth of phytoplankton, which locks in a massive amount of carbon from the atmosphere.

By their sheer scale, large whales lock in huge amounts of carbon, however researchers estimate that this has been reduced by approximately nine million tonnes by commercial whaling.  Indeed, the mass slaughter of whales in the 19^th and 20^th centuries may well have accelerated the effects of climate change, by both increasing the release of carbon into the atmosphere and diminishing the role whales play in locking it back in the oceans.

Put simply, we need more whales in the ocean to help combat the impact of climate change.  The more whales there are, the healthier the oceans will be and the less carbon dioxide there will be in the atmosphere.