Nigeria Sudan savannah is similar but with shorter grasses and shorter trees. Sahel savannah consists of patches of grass and sand, found in the northeast. In the Sahel region, rain is less than per year and the Sahara Desert is encroaching. In the dry northeast corner of the country lies Lake Chad, which Nigeria shares with Niger, Chad and Cameroon. Nigeria's Delta region, home of the large oil industry, experiences serious oil spills and other environmental problems, which has caused conflict. Waste management including sewage treatment, the linked processes of deforestation and soil degradation, and climate change or global warming are
Military of Chad participated in a peace mission under the authority of African Union in the neighboring Central African Republic to try to pacify the recent conflict, but has chosen to withdraw after its soldiers were accused of shooting into a marketplace, unprovoked, according to BBC. "Currently, Cameroon has an ongoing military-military relationship with Chad, which includes associates training for Chadian military in Cameroon. There are four brigade Chado-Cameroonian in January 2012. Cameroon and Chad are developing excellent relations". Military of Chad The military of Chad consists of the National Army (includes Ground Forces, Air Force, and Gendarmerie), Republican Guard, Rapid Intervention Force,