Nature and EnvironmentExplained: Threats to marine life01:53This browser does not support the video element.Nature and Environment05/29/2019May 29, 2019The oceans cover 71 percent of the earth’s surface – and they’re home to a huge range of flora and fauna. But human activity has done them great harm. What are these threats in concrete terms? And what can we do before it’s too late?Copy linkAdvertisement