Eating seaweed and bugs sounds a lot better than starving to death? Especially since in both cases they appear to be just intermediate sources of nutrients that will get turned into innocuous food-a-likes like burgers and bacon. Sure, the cynical take is no one would willing eat them straight up (though obviously nori is around sushi, hijiki is in soup etc.) but I am not too put off by the idea...

False dichotomy. Just like green anything. Kill the planet or go back to pre-industrial living standards. How about no. Why not use our talent and resources to find ways to increase the standards of living while also improving their affordability and lessening their impact on the environment.