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Around 70 percent of our planet’s surface is covered by sea water. Estimates vary, but the oceans contain about 1.5 quintillion (1,500,000,000,000,000,000) tons of the life-giving liquid – and there’s a lot more circulating in the air, in the ground and in our bodies. So you might imagine that providing sufficient water for the world’s population to survive and prosper isn’t much of a challenge.