Bullshit.
A large portion of the population have been vegetarian for a long time. How is something alive and well and growing be unrealistic
A large portion of the population have been vegetarian for a long time. How is something alive and well and growing be unrealistic
Seaweed per day per cow := 0.085kg
Seaweed per year per cow := 31.025kg
Seaweed per year for cow population := 31,025,000,000kgs
Global seaweed production := 6,350,293,180kgs
So, we'd need to increase seaweed production by 5 times. We would then need to distribute this from the largest producers (China, Japan, Korea) the countries that consume the most (Europe, US). This isn't a problem that can be solved by mandated changes in a matter of years, and I have no idea what the CO2 output would be for this sort of production and shipping.
None of this needs to be binary this or that though. We can limit or eliminate our intake of meat products through personal choice AND engineer solutions to minimize environmental harm. We can do both and it does not have to be unanimous.
Also, there absolutely is a very real cultural shift happening right now that is embracing flexitarian/vegetarian/vegan diets.
I also don't have data on this, but I think there has been a much bigger rise in performative veganism than actual veganism. For example many popular twitch streamers say they are vegan, and then the next week viewers point out they are eating a cheeseburger on stream and they'll say "well I'm not today obviously".