If there were more oxygen in the atmosphere than its current level, burning reactions would occur faster, and rocks and metals would be eroded much more quickly. Therefore, the earth would erode away rapidly, posing a major threat for life.
International news website based in New York – USA, Rescue News, published Harun Yahya’s article “How does the Earth breathe?” on April 14th 2017. You may read the article at the below links.
http://www.harunyahya.com/en/Articles/244729/How-does-the-Earth-breathe