: 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.
In closed type of brain injury, there is no damage to the skull. Based on type of force and amount of force, brain injury may be classified into different categories, as follows. Concussion: It is the most common and minor form of head injury. Ideally, concussion refers to a temporary loss of consciousness in response to head injury.