Wed, 13 Jun 2018
GLOBAL - Which food type is more environmentally costly to produce - livestock, farmed seafood, or wild-caught fish?
The answer is, it depends. But in general, industrial beef production and farmed catfish are the most taxing on the environment, while small, wild-caught fish and farmed mollusks like oysters, mussels and scallops have the lowest environmental impact, according to a new analysis.
The study appeared online 11 June in the journal Frontiers in Ecology and the Environment, and its authors believe it is the most comprehensive look at the environmental impacts of different types of animal protein production.
"From the consumer's standpoint, choice matters," said lead author Ray Hilborn, a University of Washington professor in the School of Aquatic and Fishery Sciences. "If you're an environmentalist, what you eat makes a difference. We found there are obvious good choices, and really obvious bad choices."
The study is based on nearly a decade of analysis, in which the co-authors reviewed hundreds of published life-cycle assessments for various types of animal protein production. Also called a "cradle-to-grave" analysis, these assessments look at environmental impacts associated with all stages of a product's life.
Of the more than 300 such assessments that exist for animal food production, the authors selected 148 that were comprehensive and not considered too "boutique," or specialized, to inform their new study.
As decisions are made about how food production expands through agricultural policies, trade agreements and environmental regulations, the authors note a "pressing need" for systematic comparisons of environmental costs across animal food types.
"I think this is one of the most important things I've ever done," Professor Hilborn said. "Policymakers need to be able to say, 'There are certain food production types we need to encourage, and others we should discourage.'"
Broadly, the study uses four metrics as a way to compare environmental impacts across the many different types of animal food production, including farm-raised seafood (called aquaculture), livestock farming and seafood caught in the wild. The four measures are: energy use, greenhouse gas emissions, potential to contribute excess nutrients -- such as fertilizer -- to the environment, and the potential to emit substances that contribute to acid rain.
The researchers compared environmental impacts across food types by using a standard amount of 40 grams of protein -- roughly the size of an average hamburger patty, and the daily recommended protein serving. For example, they calculated how much greenhouse gas was produced per 40 grams of protein across all food types, where data were available.
"This method gives us a really consistent measurement people can relate to," Professor Hilborn said.
The analysis showed clear winners that had low environmental impacts across all measures, including farmed shellfish and mollusks, and capture fisheries such as sardines, mackerel and herring. Other capture fish choices with relatively low impact are whitefish like pollock, hake and the cod family. Farmed salmon also performed well. But the study also illuminated striking differences across animal proteins, and the researchers advise that consumers must decide what environmental impacts are most important to them when selecting their food choices.
Some of the additional findings include:
In the future, the researchers plan to look at biodiversity impacts as another way to measure environmental costs. The analysis also mentions a range of other environmental impacts such as water demand, pesticide use, antibiotic use and soil erosion that were addressed in some of the studies they reviewed, but not consistently enough to summarize in the study.