Deforestation causes erosion of top soil, nutrient imbalances, dust storms and land slides. Even the type of farming that goes hand and hand with land ownership causes environment problems.
This view seems like foolhardy view, endorsed because of its prevalence on earth in powerful nations.
Regarding point #2, poverty is relative. Although you may consider not having internet to be poverty, much of the world couldn't care less about it. Hunter/Gathers native to Sudan, central, and south africa live the way they do because it is considered to be their culture (they choose to do it). So there is no "poverty" to be talked about. "Being behind" and "Building wealth" sound like nonsense that they deliberately want no parts of. Their state is not something they're trying to get away from. It is desired. So your notion of 'not owning land' put them in this position is false. Their will-power is why they live traditionally, not land ownership.
Living natively didn't cause the land grab. Other people's notions of land ownership is what caused the land grab. If it were not for people who think they own land, there would have been no land grab...
Your logic seems to be completely backwards.