: 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.
Brain damage: Symptoms, causes, treatments. Brain damage, or brain injury, affects brain cells and is often the result of a head injury, accident or trauma. Brain damage can affect a person's thinking, understanding, language skills and memory. There are two types of brain injury: traumatic brain injury and acquired brain injury.