No news article for this, so I'll just mention some points:

• PROTEIN THO
• because of increases in GHGs, plants may grow more ("greening"), but the growth is rich in carbohydrates, leaving behind relatively a lot of other nutrients, especially Nitrogen based ones (amino acids)
• while ruminants can digest low-nutrient plant matter better than others, it doesn't make proteins appear out of nowhere. Large herbivores are already at the far end of "low nutrient use"
• this will lead to lower growth rates
• the low growth rates will mean huge losses for animal farmers, the rancher/herder types especially, the ones who rely on pastures and hay instead of concentrated feed
• they'll want to fertilize grasslands with nitrogen fertilizers (like planted grasslands... like lawns, which are perennial feed crops)
• they'll want to use more feed like soybeans