Kelp is an alternative for the north. Unfortunately it's been disappearing because of warming oceans. https://www.pewtrusts.org/en/research-and-analysis/articl

Kelp is an alternative for the north. Unfortunately it's been disappearing because of warming oceans. https://www.pewtrusts.org/en/research-and-analysis/articles/2020/05/27/5-reasons-to-protect-kelp-the-west-coasts-powerhouse-marine-algae https://www.pewtrusts.org/en/research-and-analysis/articles/...