Cascadia Seaweed believes its cornucopia of kelp could change the plant-based food world. What do Vitamin B12, seaweed and “co-opetition” have in common? The future of climate-friendly eating, if Vancouver Island-based aquaculturist Mike Williamson has his way. With co-founders William Collins and Tony Ethier, Williamson runs Cascadia Seaweed, the largest provider of ocean cultivated seaweed in North America. He has helped make Cascadia a leader in one of the world’s fastest-growing industries: plant-based food. In the plant-based world, ocean-cultivated seaweed is an obvious choice. Cultivation requires no freshwater, fertilizers, pesticides,…