Ultimately, the most rigorous traceability solutions, including QR codes and microchips, won't be useful if people don't actually check them as a condition of making their purchases. Imitators can simply counterfeit QR code labels, for example.
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Last year, the Marine Conservation Society said mackerel was "under immense pressure from fishing activities across multiple nations" and that the stocks would soon be unable to replenish naturally.
The penguins' feathers are "the most complicated and best insulating of any animal", he says. Over time they are damaged, so the penguins shed them annually.