"A Changing Pacific Coast" Poster
This poster from the September 2016 issue of National Geographic is still one of the best visualizations I've seen of climate change impacts to aquatic ecosystems along the Pacific coast. It's beautifully illustrated and features lots of great information about the effects of warming, currents, and ocean acidification on the food web.
The link above will take you to a downloadable, printable PDF version that could make a really nice teaching resource or poster for a classroom or nature center. To print it full size, you'd either have to use a large-format printer or print on multiple pages.