Abandoned fishing nets, known as ghost nets, make up 10 per cent of all marine trash. Every year 640,00 tonnes (705,500 tons) of the nets enter the oceans, ensnaring wildlife and devastating marine ecosystems. Hong Kong diver Harry Chan has made it his life’s mission to fight ghost nets, and so far he and his team of volunteers have removed 60-70 tonnes of such debris from Hong Kong waters. “I have been tangled quite a few times,” Chan says, admitting that on a few occasions he almost got…