I wonder what the scientific background of the “research” team is. Very little information is given here, but the little provided tells me that they overlooked quite a few pertinent facts in this “study.”
Two of the omitted considerations are that 1) cows, sheep, beans, tomatoes—every food we eat—is made out of atmospheric carbon dioxide. Therefore, it is impossible for any food item to cause an increase of CO2 in the atmosphere; and 2) that animals eat plants and plant parts that are inedible to humans, and therefore make land use more efficient by decreasing plant waste.
Widespread vegetarianism and veganism would both necessitate turning vast amounts of land to agricultural use, which would decrease habitats for wildlife. Although wildlife might decrease, too, as desperate people turn to eating wildlife when animal products are no longer allowed to be sold. And I hate to think of the medical issues, along with the aggressiveness and loss of mental resilience that result from plant-based diets.
I bet that is the real aim of moving people to vegan/vegetarian diets, albeit not spoken.
I'm suspect of most if not all "policies" touted using the AGW/climate change banner.