Researchers say they’ve discovered a cause of marine toxicity along the coast between Northern California and Southern Oregon.  As a result, they’re warning against eating any crabs, clams, or other seafood that comes from the coast.  The coastal hot spots they’ve pinpointed apparently began emerging in 2013 and materialized with climate change over the years.  They say a heat wave in 2013 set off a chain of reactions within the marine eco-system that included a harmful algal bloom that closed many fisheries in 2015.