A difficult time for reef sharks
![](https://natalieparletta.com.au/wp-content/uploads/2020/07/200723-Grey-reef-sharks-1024x573.jpeg)
Reef sharks are having a challenging time as they confront threats from fishing, denser human populations and climate change.
An extensive survey has found that adults have effectively become extinct in nearly a fifth of the world’s tropical oceans, while a separate study reveals that, even when protected, shallow shark nurseries are affected by warming water and diminishing oxygen levels.
Published by Cosmos.