Which is a shame, because the U.S. has the largest federal water zone in the world, with more ocean area suitable for deep-water fish farming than the country has arable land area.

FORBES: Regulatory Uncertainty Drives A Fish Farmer To Foreign Waters

Just 12% of China's total area was arable in 2011, according to the World Bank, compared to 17.5% in the U.S. and 34% in Germany.

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In 2008, 3 350 million ha were used as permanent meadows and for pasture, more than twice the area used for arable cropping and permanent crops.

UNESCO: World Water Assessment Programme (WWAP)