What are we trying to accomplish? I think:

- Use arable land where it exists, not just where the cheapest labor is

- Don't do deforestation or other such things

I would like policies that directly address this:

- Legal immigration fairly moves the people the arible land, rather than moving the farming to the cheap people. The goal would be in 200 years there is enough economic development and immigration that there is no longer global scale labor arbitrage.

- Paying to protect the land we directly care about directly protects that land, and removes the incentive to farm there after all. (If you farm there, you loose the preservation rent.)

Farmers in brazil are notoriously far-right-wing, just like else where, and so paying the gov to not farm has other return-to-center-and-sanity benefits too.