Congo, a mineral-rich nation in central Africa, is thought to have significant oil reserves, too. Drilling has so far been confined to a small territory on the Atlantic Ocean and offshore, but that's expected to change if the government successfully auctions 30 oil and gas blocks spread around the country. Leaders say economic growth is essential for their impoverished people, but some communities, rights groups and environmental watchdogs warn that expanded drilling will harm the landscape and human health.
