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Protecting our oceans is not optional

Ours is a watery world. More than 50 seas float among five oceans, which collectively cover some 70 percent of the surface of the planet. Their depths are home to riches told and untold - many of which face depletion or extinction as a result of climate change, overfishing and ocean acidification. One way to reduce threats is to create marine protected areas (MPAs). They currently account for less than 3 percent of our seas - by way of contrast, landmass enjoys a 12 percent protection rate - but awareness of the need for more marine protection is growing.