If the rest of the world depends on it, then that sounds like a great reason for the rest of the world to pay a large sum of money to Brazil, in exchange for it

If the rest of the world depends on it, then that sounds like a great reason for the rest of the world to pay a large sum of money to Brazil, in exchange for it's services. That would certainly be cheaper than a war, which would probably just cause a large amount of damage to the forest anyway.