Go vegan.

€1.5 million, please.

This is mostly greenwashing and false hype by the beef industry with misleading numbers

What’s more, feeding cattle algae is really only practical where it’s least needed: on feedlots. This is where most cattle are crowded in the final months of their 1.5- to 2-year lives to rapidly put on weight before slaughter. There, algae feed additives can be churned into the cows’ grain and soy feed. But on feedlots, cattle already belch less methane—only 11 percent of their lifetime output

[...]

Unfortunately, adding the algae to diets on the pasture, where it’s most needed, isn’t a feasible option either. Out on grazing lands, it’s difficult to get cows to eat additives because they don’t like the taste of red algae unless it’s diluted into feed. And even if we did find ways to sneak algae in somehow, there’s a good chance their gut microbes would adapt and adjust, bringing their belches’ methane right back to high levels.

[...]

All told, if we accept the most promising claims of the algae boosters, we’re talking about an 80 percent reduction of methane among only 11 percent of all burps—roughly an 8.8 percent reduction total

https://www.wired.com/story/carbon-neutral-cows-algae/

a good additive is seaweed, and has already been commercialised in Tasmania years ago

https://www.dairynewsaustralia.com.au/news/world-first-low-emission-milk/

Cattle herds went through a pretty nasty culling just a year or two ago. And that's been part of a 40 year long term downward trend, as cost to raise by head has grown with drought and feedstock price increases. 2014 and 2024 being particularly rough years for the industry as a whole.

Like, I guess it's good that we're seeing research into herd emissions. But I have to wonder whether it'll even matter relative to the continuing slide in overall herd populations.