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Re:Tasty Seaweed Reduces Cows’ Methane Emissions by 99% by leipert on Friday August 16, 2019 @12:25PM (#20716782)
Mhm... Looking at the numbers again:

291,000 metric tons per day => ~ 106 Million metric tons per year.

In 2014 the world wide Aquatic Plants (which include ALL Macro-Algae) production was around 27 Million tons [0].

[0]: http://www.fao.org/3/a-i5555e.pdf, page 24, table 7

Re:Tasty Seaweed Reduces Cows’ Methane Emissions by 99% by badestrand on Friday August 16, 2019 @12:57PM (#20717069)
Current production shouldn't matter and the sea is huge - if the algae are uncomplicated to grow I don't see any reason why there should be a limit to future production.
Re:Tasty Seaweed Reduces Cows’ Methane Emissions by 99% by TendOcean on Saturday August 17, 2019 @06:47PM (#20726927)
You mean other than the fact that techniques for efficiently growing such amounts of seaweed do not exist? Of the amount produced globally today, 90% comes from China, Korea, Japan, and the Philippines and that production is all very labor intensive and done in locations and using methods that are simply not applicable to the United States.

There is a huge about of R&D needed to get any of this to scale. Some of it is already underway.