For the sake of sparking a little bit of discourse, this does seem like one of those classic cases of taking the worst case scenario, making a few favorable assumptions to make it even worse, and then publishing it as truth.

>“Up to 80% of emperor penguin colonies are projected to be quasi-extinct by 2100 [population declines of more than 90%] with business-as-usual increases in greenhouse gas emissions,” it found.

This sounds pretty bad at first glance, but the only sign of a mechanism behind the extinction is this quote:

>“The emperor penguin relies on ice for breeding,” Lee said. “If it loses its suitable breeding habitat … that can lead to [population] collapses over time.”

Without any other information, this just sounds like they are making a bit of a jump from "the ice will melt" straight to "they won't be able to figure out how to breed without the ice and they will all die"

That being said, there are more than enough good reasons to try to limit global warming, but this feels like a publication that was searching for the most extreme result possible.