| http://www.w3.org/ns/prov#value | - Today, North Americans eat about half C3 plants, including vegetables, fruits and grains such as wheat, oats, rye and barley, and about half C4 plants, which largely come from corn, sorghum and meat animals fed on C4 grasses and grains.The highest human C3 diets are in northern Europe, where only C3 cool-season grasses grow, so meat animals there graze on them rather than on C4 tropical grasses.
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