[Springtime]

The authors' argument about the 8.8% reduction hinges on both their assumption that it wouldn't be feasible to add to cows' diets on pastures and the uncertain possibility their guts would adapt and mitigate the effectiveness.

Yet the articles they cite (which both quote the same study) describe that on a diet of 0.75% seaweed (0.25% more than the research I saw years prior) only some cattle didn't like the taste and there was an unspecified reduction in feed intake, which hardly seems the foregone conclusion the Wired authors make it out to be. While the aspect about cows' gut reactions long term is also unknown, though one of their links mentions both a 72 and 90 day trial which showed no gut adaption or reduction in effectiveness which is said to be hopeful since 'most adaptations happen within a few weeks'.

Ironically the On Pasture link Wired cites for their argument against is more neutral/optimistic and also mentions that two other more common types of seaweed reduce methane output by 20% and encouraged experimenting with for cattle diets.