Whales too are experiencing lots of pressure from climate change. Many depend on krill, fish, or seals for food. As those numbers fall along with the melting ice, whales are struggling more and more.
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(Credit: BBC Earth)

Some whales will have to travel further or to different parts of the world in order to find food and a suitable climate. Some, like Blue Whales (which feed on plankton) will have to deal with less food. Some, like Beluga whales, will face similar challenges as the Walruses (they also feed on benthic organisms as well as fish).  
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(Credit: Philippine Chambault and WWF)

Killer Whales will likely push local species out of their habitats, steal their food sources, and give them illnesses.

(Credit: National Geographic)

While killer whales are likely to benefit in the short term, they too will struggle as the food sources continue to disappear. Killer whales could have more frequent fights with walruses and polar bears as ice melts and they clump in the coldest regions. This will further harm all three populations.
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Additionally, there are a variety of killer whale types each with their own feeding habits, ranges, and traits. Many will face additional pressure as their food sources shrink, their ranges change, and their encounters with new unfamiliar organisms grow.
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Special thanks to Carlos Navarro and Steve Zeff for their whale expertise and assistance with this section!