Why has oat milk become so popular? Firstly oat milk is accessible to a lot of people who can’t drink other types of milk. Secondly, it has a low environmental impact and is a sustainable system: if you compare a 200 ml glass of oat milk vs. 200 ml glass of cow milk, you get this: to produce the glass of oat milk, about 0.8 square meters of land and 5 liters of water is requered. The CO2 emission is just under 0.3 kg. To produce a 200 ml glass of cow’s milk 3.9 square kms of land and about 120 litres of water is required. The CO2 emission is just above 0.6 kg. That’s a massive difference!