It would be such a small but significant thing to pass a law requiring adding seaweed to their feed. Even if they passed the cost on, it would raise the price of meat insignificantly. It's crazy that we haven't done it yet. Same with making new roofs white to reflect light instead of absorbing it.
I looked it up and it says a 28% reduction was achieved. That's still a huge reduction and perhaps, with other feed formulations, an even bigger reduction can be made.
I mean, it's better than nothing but seriously dairy is fucked long term. It will always be an inefficient system compared to consuming plant-based proteins directly, and lab grown milk protein is gonna be huge. And that is good news, because dairy farming sucks in terms of land use, fertilizer run off, animal welfare, and, here in NZ at least, the destruction of native tree based ecosystems to make way for grass monocultures.