: Methane is emitted during the production and transport of coal, natural gas, and oil. Methane emissions also result from livestock and other agricultural practices and by the decay of organic waste in municipal solid waste landfills.
Traumatic Brain Injury (TBI) - Levels of Severity. Mild TBI. Loss of consciousness is very brief, usually a few seconds or minutes. Loss of consciousness does not have to occur - the person may be dazed or confused. Testing and scans of the brain may appear normal. Most common: 75%-85% of all brain injuries are mild.
TBI is an injury to the brain caused by a blow or jolt to the head from blunt or penetrating trauma. The injury that occurs at the moment of impact is known as the primary injury.Primary injuries can involve a specific lobe of the brain or can involve the entire brain.ypes of traumatic brain injuries. Injuries involving the entire brain are called diffuse: 1  Concussion is a mild head injury that can cause a brief loss of consciousness and usually does not cause permanent brain injury. 2  Diffuse axonal injury (DAI) is a shearing and stretching of the nerve cells at the cellular level.