Whiskas and Sheba will become the first U.K. companies to sell sustainable cat food later this year. The pair of Mars Petcare-owned brands will be available throughout Europe and will only use Marine Stewardship Council-certified fish that do not the decrease the dwindling supply. "There is no quick fix to this problem but when companies as influential as Mars take a leadership role, it is great news for the world's oceans," said Jason Clay of the World Wildlife Fund.

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