Environmentally conscious consumers who switch from cow’s milk to soya milk may be doing harm to the rainforest because it is cleared to grow soya beans.
Vast areas in South America, including in the Amazon, have been cleared to grow soya and demand for it continues to drive illegal deforestation.
Rainforest soil is usually pretty shitty. You’d not be able to plough it for long. That’s why the indigenous farming method is peripatetic slash and burn.
It tends to be the cerrado – savannah – or pasture like the pampa that gets ploughed.