Human activity is causing environmental degradation, which is the deterioration of the environment through depletion of resources such as air, water and soil; the destruction of ecosystems; habitat destruction; the extinction of wildlife; and pollution.
Screening for abdominal aortic aneurysm (AAA) Research studies suggest that a routine ultrasound scan is worthwhile for all men aged 65. This is because most people with an AAA do not have symptoms. Following a routine scan, surgery can be offered to men found to have an aneurysm over 5.5 cm wide.
About one person in 1000 develops an abdominal aortic aneurysm between the ages of 60 and 65, and this number continues to rise with age. Screening studies show that abdominal aortic aneurysms occur in 2 to 13 percent of men and 6 percent of women over the age of 65. However, almost 90 percent of the aneurysms identified by screening are small (less than 3.5 cm in diameter) and unlikely to burst.