My main skepticism (Shark lover here btw!)

Is that sharks are an ancient species and they’ve survived way warmer oceans even relatively recently.

For example the Medieval Warm Period Sargasso Sea surface temperatures were 1°C warmer than 400 years ago, and Pacific Ocean water temperatures were 0.65°C warmer than the decades before.

Sharks are an ancient division of life, roughly 440 million years old, which has survived far warmer oceans.

There are ~500 living species of shark and likely tens of thousands extinct in their lineage.

We are perpetrating a mass extinction event that incorporates not just temperatures, but ocean acidification and trophic cascade for fisheries. In mass extinctions, enough things about the ecosystem change that specialists often go extinct. Great White Sharks are a specialist species in their extreme size; Most size specialists are in a precarious local maxima that disappears too quickly to adapt if conditions change drastically.

The warmer ocean thing seems to be blanketing over the real issue: we are overfishing.

Which is really heartening to me, because decreasing the temperature of the ocean seems daunting, but not dragging giant nets through the ocean nonstop seems pretty straightforward.

Were there any periods in which the rate of change in warming was the same or greater?

> Is that sharks are an ancient species

For a shark lover, you should know that shark is not a species, but a taxonomy group.

From there, everything else you assume is incorrect (ie: some species of sharks have definitely gone extinct)

I presume it was due to the temperature gradient being extremely low, so they could gradually adapt to the change over hundreds of years. We're pulling the handbrake in geological terms.

https://xkcd.com/1732

(that chart was made in 2016, given that we were at +1.5C last year we're outdone even the most pessimistic scenario presented on that graph by quite a bit, the line is now almost horizontal)