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.
COPD patients can live normally with higher levels of CO2 and lower levels of oxygen. For instance, a pt. with COPD can have a CO2 level of 50 and an oxygen level of 84 and that is their normal because they are have chronic respiratory failure just like pt. with C-spine injury or pt. with ALS.