Oceans worth $24 tn, but sea change needed to save them says WWF

The world's oceans are awash in riches, with output rivalling that of some of the world's largest economies, but over-fishing, pollution and climate change are rapidly eroding those resources, WWF warned Thursday. In a new report, the conservation group said oceans each year generate goods and services worth at least $2.5 trillion, while their overall value as an asset is worth 10 times that. If oceans were a nation, they would constitute the world's seventh largest economy, ranki