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.
An oxygen level in the range you mention (88% or less) is the usual indication for starting oxygen in patients with COPD. It is perhaps easier to answer the question of what oxygen can do in this situation, rather than what the effects of a low oxygen level are.