As seen in Chapter 5, things like transport and packaging tend to have small emissions. One large meta-analysis, published in Nature, looked at the environmental impact of fish from thousands of fish farms and wild fisheries.33 They found that most of the popular fish we eat – tuna, salmon, cod, trout, herring – were the most climate-friendly types of meat. Fish are not quite as good as plant-based protein sources, but they can still be a fairly low-carbon choice. Most fish perform well on other environmental metrics too. They’re nearly all better than chicken.
