[Freak_NL]

Of all the mammal milk alternatives oat milk seems the most environmentally friendly in temperate climates, as it can be grown regionally.

Although some point out that any plant-based milk is significantly better for the environment than mammal milk:

https://www.theguardian.com/environment/2020/jan/28/what-pla...

[howlin]

Soy milk is just as reasonable environmentally and probably a little healthier as a nutrition source compared to oat milk. Though the flavor of soy is a little harder to get used to.