Another factor to consider with cows is large scale cattle farming, grass fed or not, releases huge amounts of methane gas into the atmosphere. Methane gas is

Another factor to consider with cows is large scale cattle farming, grass fed or not, releases huge amounts of methane gas into the atmosphere. Methane gas is estimated to be 28[1] times worse for climate change than C02. [1] https://en.wikipedia.org/wiki/Atmospheric_methane https://en.wikipedia.org/wiki/Atmospheric_methane