The oil giant Exxon Mobil has acknowledged a new oil spill off the coast of southern Nigeria. Residents of Akwa Ibom state have reported seeing oil deposits massing along the coastline. Exxon says the size of the leak remains unclear. Akwa Ibom is a part of the Niger Delta region, which a U.N. report one year ago said will already need 30 years and around $1 billion to at least partially recover from environmental damage caused by major oil companies.