Milk is heavily subsidized, nuts are not. We could integrate (nut) trees into our agricultural fields, it would help with local temperatures, water retention, soil erosion, biodiversity, nutrition availability, the list is endless ... and the price of nuts would go rapidly down.
> require a gasoline to be transported to places that are quite close to actual cows
https://ychef.files.bbci.co.uk/1600x900/p0c41fcj.webp - Emissions (in kg CO2e) from the food supply chain – the climate impact of food miles is often a small proportion (Source: Our World in Data/Poore and Nemecek, Science, 2018)
> that thing you described does not sound like milk
That is a universal recipe for a plant based milk (lookup some recipes on the net if you don't believe it).