From what I've heard from people in the Amazon, the cocaine mafia people don't like the cow people and will stop them from advancing further into the jungle in some areas (where the cocaine mafia presumably has their operations), so in a way, they actually reduce overall deforestation, even as they themselves do cut down areas of the forest for coca plantations and gold mining and such. They'll need to stop doing that stuff at some point.
If anyone would be interested in assisting reforestation efforts in the Amazon or elsewhere, that would be cool. Protecting Borneo and southern Cameroon from palm oil expansion would probably be a good idea too.