it's no wonder so many have moved into bentiu camp.t's run by the united nations, and houses 140,000 people displaced by war, and now by climate change. the floods have hit our country when we are very vulnerable. south sudan was founded only 13 years ago after decades of civil war. we hoped for peace, but fighting continues in many areas. the nation's poor and the government depends almost entirely on oil for income. the country's oil fields, including in unity state, can produce crude oil worth approximately £9 million sterling a day. the bbc has spoken to david bojo leju, formerly a senior engineer for gpoc, an oil consortium in unity state. i got a job with the greater pioneer operating company, gpoc, as construction supervisor, in the five fields of unity state. nothing can go without us knowing in the oil field. gpoc runs the unity state oilfield. it's a joint venture between malaysian, indian and chinese oil companies, with south sudan's government owning 5%. david alleges that gpoc mismanaged its facilities, polluting the envir