Depending on the area seen in an individual picture, brown, yellow and green continents can be seen or parts of Earth can be covered by white clouds. Earth is by far the most dynamic planet when seen from space.
Oxygen therapy is a medical treatment. It must be prescribed by a doctor. For people with COPD, oxygen therapy can be a helpful part of their treatment plan. The prescription your doctor writes will include: If you need oxygen for rest, exercise and/or sleep, and how much in liters per minute (lpm) for each activity.
Some people fear that using supplemental oxygen will worsen their COPD or make them dependent on oxygen. However, this is not a cause for concern. To determine whether you need oxygen therapy, your doctor will measure oxygen levels (along with other variables such as carbon dioxide levels) in your blood.