For those of you who liked the movie "Avatar" and story behind, it is interesting to note that John Perkins in his book "Confessions of Economic Hitman" discusses how a "Christian missionary" group was used to move an indigenous group in Ecuador off their land when oil was discovered under it. Once the indigenous people were gone, the oil companies moved in. Great book check it out yall.
http://www.economichitman.com/pages/bookpages/thebook.html