* Loss of a key predator: Humpback whales are important predators of krill, a small shrimp-like crustacean. Krill are a major food source for many other marine animals, including fish, seabirds, and seals. The loss of humpback whales could lead to a decline in krill populations, which would have a ripple effect on the entire marine food web.
* Changes in ocean currents: Humpback whales are known to play a role in ocean circulation by transporting heat and nutrients through their migrations. The loss of humpback whales could disrupt ocean currents, which could have a number of negative consequences, including changes in weather patterns and sea level rise.
* Loss of a carbon sink: Humpback whales store a significant amount of carbon in their bodies. When they die, this carbon sinks to the bottom of the ocean, where it can remain sequestered for thousands of years. The loss of humpback whales would release this carbon into the atmosphere, contributing to climate change.
Economic consequences
* Loss of tourism revenue: Humpback whales are a popular tourist attraction, and their loss would have a significant impact on the economies of coastal communities that rely on whale-watching tourism.
* Loss of jobs: The whale-watching industry employs thousands of people, and the loss of humpback whales would lead to job losses in these communities.
* Loss of cultural heritage: Humpback whales are an important part of the cultural heritage of many coastal communities, and their loss would be a significant blow to these communities.
Ethical consequences
* Loss of biodiversity: Humpback whales are an important part of the planet's biodiversity, and their loss would be a significant loss for the entire world.
* Moral obligation: Many people believe that we have a moral obligation to protect humpback whales from extinction. Humpback whales are sentient beings, and they deserve to be protected from harm.