Protein drinks and baby formula could offset Greek yogurt's dark side

Acid whey, a byproduct of Greek yogurt production, causes environmental problems but rebranding could create a market for it among the health-conscious

Dairy lovers around the world were introduced to an alarming fact a few years ago. Greek yoghurt, a $2bn-a-year industry, had a dark side. Some headlines even declared it was "destroying our planet".

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