A recent study published in the journal Nature Climate Change has some advocates seriously concerned about the future of fish. Why? Their findings are grim: If atmospheric carbon dioxide levels continue rising over the next date, fish may start losing their ability to recognize different sorts of smells.
A natural question, of course, is: Why do fish need to smell? Perhaps surprisingly, a fish's ability to smell is hugely important to their survival.
As Christina Caron explains at The New York Times, fish use their sense of smell to find safe food, habitats, and avoid danger. They do this by "smelling" (sensing) chemicals suspended in their water.