(CNBC) -- A Norwegian billionaire, who started out as a fisherman, has said he will give away most of his estimated $2.6 billion fortune in a bid to help clean up the world's oceans.
Kjell Inge Røkke, described in Forbes magazine as a "ruthless corporate raider", wants to build a 596-foot marine research ship that will scour the seas scooping up plastic litter.
Røkke told Norway's Aftenposten newspaper that he wanted "to give back to society what I've earned" and described the cost of the ship as costing "the lion's share of his fortune".