What is the biggest threat to orcas?

What are the most pressing concerns facing orcas in the wild today? Is it the decline of their natural prey due to overfishing, the disturbance of their habitats from human activities, or perhaps the entanglement in fishing nets and other debris? Could it be the impact of climate change, which is altering their feeding grounds and migration patterns? Or could it be the cumulative effects of all these factors, making it difficult for orcas to survive in the wild? It's crucial to understand the biggest threats facing these majestic creatures in order to develop effective conservation strategies and protect them for future generations.