What will happen if earth's oxygen levels permanently rise 20%?

Answer 1

It will correct itself. Oxygen is an accelerant, so if oxygen levels rise significantly, incidences of natural forest fires etc will rise and offset the change. That's why oxygen levels equilibrated where they presently are.

Answer 2

We would probably all be a lot healthier and heal a lot faster........read the following article on hypobaric chambers:

Q: So how does being inside a pressurized chamber give us more oxygen?

A: When we sit inside a chamber pressurized at twice the normal air pressure it may not feel different, but we breathe double the number of molecules. Breathing pure oxygen in such a chamber gives us 10 times the regular amount of oxygen. In one hour we can inhale 2.4 pounds of oxygen! Red blood cells instantly fill with oxygen and the extra oxygen dissolves directly into the blood fluid. In a few minutes this extra oxygen builds up tissue oxygen levels far above normal. This action has been scientifically proven to stimulate healing. In order to raise tissue oxygen tension to 80 mmHg for optimal healing one must have oxygen delivered under increased atmospheric conditions. This is not a plastic bag but a solid chamber certified to safely hold the high pressure. How high? The pressure against a 30" hyperbaric chamber hatch at 2 atmospheres has about 10 tons of pressure exerted against it!

Q: What is the history of HBO2?

A: The first pressurized room used to treat health problems was built by an Englishman named Henshaw in 1662; however, it was not until over a century later in 1788, that compressed hyperbaric air was put to large scale use in a diving bell for underwater industrial repairs of an English bridge. The first deep sea diving suit, invented in 1819 by August Siebe, used compressed air supplied to the helmet for generous underwater movement. A French iron shop in 1834 built the first hyperbaric tank under the direction of Dr. Junod. A copper sphere five feet in diameter with the appropriate viewports and compressed air fittings became the center of attraction for many patients. He reported wonderful recovery from a variety of debilitating conditions in the Bulletin of the Academe of Medicine. Hyperbaric enthusiasm spread among the European countries during the next forty years. Sick people came from America to try the new therapy. An enterprising Canadian built the first North American hyperbaric chamber in 1860.

Answer 3

We will all burn up.
20.9 % is the correct level for oxygen .
the low alarm point is 19.5%
the height alarm point is 21.5%
the high ,high alarm point is 23% at this level every thing burns like it has gasoline on it.