"* Scientists, using soil sample analysis to study oxygen levels during the Permian Period, have discovered that the oxygen content during this very "life friendly" period was 30%. Furthermore, these scientists also discovered that oxygen levels during the "Great Dying" period, where massive extinction events occured, had dropped to 16%, eventually "bottoming out" at 12%. During this time when oxygen was at its lowest levels, 90% of all marine life died, as well as nearly 75% of all land-based plants and animals.

"Oxygen dropped from its highest level to its lowest level ever, in only 20 million years.."

* The shock of an 18% drop in oxygen content over a 20 million year period can hardly compare with the reality humanity is faced with in modern times: A 2-3% drop in oxygen levels in less than 100 years. " Læs mere om Ozon og Oxygen Terapi