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.
Usually no harm occurs with short-term use of oxygen. However, acute respiratory failure from COPD is a special case because uncontrolled administration of oxygen in this condition may cause acute hypoventilation and carbon dioxide retention with dire consequences including coma following CO2 narcosis.