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Advocates of grass-grazing cattle say it's better for the environment and the animals. But there's another upside: Grass-fed meat and dairy fetch a premium that can help small farms stay viable.
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Like the U.S., China is battling obesity and climate change. So it's urging citizens to eat less meat — and spreading the word with public service ads featuring Hollywood stars.
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Long before cooking was common, early humans needed extra energy to fuel bigger bodies and brains. Scientists say simple stone cutting tools likely allowed small-toothed meat eaters to thrive.