Brazilian farmers are lobbying to roll back deforestation restrictions in order to sell more soybeans to the huge Chinese market.

What happened is kind of like what happened to the cotton market in the Civil War — back then the South decided to threaten to withhold cotton destined for British mills in order to force the British to intervene on their side. Instead, the mill owners set up a cotton industry in Egypt, and stopped needing to buy from the US anymore. This meant that the high profits from cotton never returned. In the same way, Chinese pig farmers have switched their sourcing of soy, and no longer buy from the US