Researchers at the University of Princeton who have been studying ice cores have found an interesting pattern in the levels of oxygen in the atmosphere over the past 800,000 years. The researchers have found that over the past 800,000 years oxygen levels have dropped in the atmosphere. The levels have dropped .8%, but over just the past 100 years they have dropped .1%. The levels dropped so much in the past century because of the burning of fossil fuels that came with industrialization.
These findings are interesting because they reinforce the argument that humans are affecting the earth and it's atmosphere. We are literally changing proportions in a very delicate system, something we should not be messing with at all. We must wake up SOON and realize what we are doing before it is too late to fix our damage.