US imports of fish are much higher than fish grown domestically. This increases the distance that food has to travel to get to the US, damaging the atmosphere from the release of fossil fuels. There are also problems with growing fish in conventional farms in the US. Some practices of growing fish are unsustainable and contribute to environmental pollution.
Plants in the US, when grown conventionally are also unsustainably produced. They are fertilized by petrochemical based fertilizers, which cause eutrophication downstream in the Gulf of Mexico. If only there was a way to address all of these problems in one simple and effective solution...