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.
However, recent studies have demonstrated that oxygen does not increase survival in patients with less severe hypoxia. Similarly, in patients with COPD who have nocturnal hypoxemia, nocturnal treatment with oxygen does not appear to increase survival or delay the need for continuous oxygen therapy.