Populations of marine mammals, birds, reptiles, and fish have dropped by about half in the past four decades, with fish critical to human food suffering some of the greatest declines, WWF warned Wednesday. In a new report, the conservation group cautioned that overfishing, pollution and climate change had significantly shrunk the size of commercial fish stocks between 1970 and 2010. WWF's Living Blue Planet Report indicated that species essential to the global food supply were among the hardest hit.

Global marine populations halved since 1970, WWF says. (2015, September 17). Business World, p. S1/5.