Salmon in the Klamath River in the United States were once abundant. They no longer are.
Over a third of the world’s fisheries have been overexploited and the health of marine ecosystems is in decline.
Banned and disused chemicals from an industrial past continue to poison wildlife in rivers throughout the United Kingdom.
Fish exposed to noise pollution experience stress, loss of hearing and various changes to their behaviors.
"We are in danger of being unprepared for the risks posed by sea level rise," says Dr. Tom Slater at University of Leeds.
The situation sounds bleak, but not all is lost yet if conservation efforts are stepped up.