For all their popularity at Christmas, fish and seafood can be immensely complex to analyse for sustainability, as BBC Future explored earlier this year. The species of fish, where it's from and how it's caught or farmed can make a huge difference. For instance, if a fish is farmed it could risk pollution of nearby waters, risk spreading disease to wild fish and spread antibiotic resistance, among other things. But wild-caught fish result in more greenhouse gases from the boats used to catch them, and can destroy the seafloor habitat and ecosystems through overfishing.

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