Bennett says that with good enforcement on the ground, the tide of poaching can be slowed. For example, forest elephants in Central Africa occur in densities seven times higher in sites with ecoguards than without them. However, the costs of such site-based protection in terms of funds and human lives will continue to increase and be unsustainable as long as ivory profits continue to escalate giving ever-increasing incentives to kill elephants illegally and traffic in their ivory.