[thotypous]

> Modern car fuel contains ethanol (10% in the EU).

Here at Brazil, ethanol is produced from sugarcane. And sugarcane farming is actually illegal in the Amazon. The President tried to make it legal, but fortunately his decree was suspended by the Judiciary [1].

I don't doubt there may exist a few illegal sugarcane farms in the Amazon, but given how huge sugarcane farming is in southeastern Brazil, I don't think any Amazon sugarcane would significantly contribute to Brazilian ethanol production.

> Soy culture is used to create a cheap protein feedstock for the meat industry.

Soy is more of an issue for Amazon than sugarcane. But, just as you said, it is used to feed cattle, and the main issue resides in the cattle. Cattleman in Amazon usually adopt the extensive breeding system, so lots of area are required to breed cattle.

[1] https://www.conjur.com.br/2020-abr-21/juiza-suspende-decreto...