Wild-caught seafood is usually an environmentally friendly option. But a few species have greenhouse-gas footprints as large as that of beef. Robert Parker at the University of British Columbia in Vancouver, Canada, and his colleagues pulled together data about the amount of fish caught at fisheries in a number of countries. They combined this with estimates of fuel use for each class of fishery. Because fuel accounts for the majority of greenhouse gas emissions from fishing, they could calculate the total carbon footprint for each fishery. Globally, they found that carbon emissions from fisheries rose by 28 per cent between 1991 and 2011, even though total catch has barely changed.
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