Yes, trees and land are a resource. But unfortunately, it brings wealth for too little people because unlike in UK we aren't using these resources to fuel industries here in Brazil. In fact, our local industry is currently shrinking and we are just exporting natural resources and importing products created by foreign industries. I don't know any country which became rich just with farming and wood. It would be possible only in a country with a lot of land and little population. Otherwise, you can't build a lot of GPD per capita with just these activities.