Economic Times: "The 2,300-kilometre long reef - the world's biggest coral ecosystem - is suffering from its worst bleaching in recorded history due to warming sea temperatures.">The 2,300-kilometre long reef - the world's biggest coral ecosystem - is suffering from its worst bleaching in recorded history due to warming sea temperatures. Severe coral bleaching on Australia's Great Barrier Reef could cost it more than a million visitors a year and huge sums in lost tourism revenue, a survey...