Governments around the world are waking up to the scourge of plastics on our oceans and its creatures by banning items such as shopping bags and drinking straws. But an often-overlooked form of plastic waste is also a major threat to our seas: "ghost" gear.

A report released Thursday from World Animal Protection highlights that every year 640,000 metric tons of fishing nets are lost or discarded in our oceans each year, trapping and killing countless marine mammals, including endangered whales, seals and turtles. Shallow coral reef habitats also suffer further degradation from the gear, which can take up to 600 years to decompose.