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INTC 47.14-6.1%Feb 10 3:59 PM EST
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To: Dan3 who wrote (112990)10/10/2000 10:47:31 AM
From: rudedog  Read Replies (1) of 186894
 
Dan - Oxygen makes up roughly 20% of the atmosphere as O2. Carbon Dioxide makes up less than 1/2 of 1% (molecular composition - by volume the numbers are even worse for CO2). CO2 has increased about 3% in the last 50 years.

So here's the math lesson - how much of a decrease in O2 did that 3% increase in CO2 require?
Assuming constant totals for Oxygen, the change in O2 for the additional CO2 represents .03 X .015 or .00045 of the total atmosphere. The change represents .00045 /.2 or .002% change in O2.

A similar change was first observed as occurring between 900AD and 1050AD based on carbon dating techniques, when obviously the fossil fuel burn rate was insignificant. Those same techniques show that shifts of a few percent seem to occur in 300 year cycles, first up and then down, probably reflecting changes in ecological balance - a richer CO2 environment stimulates more plant O2 production, which tends to reverse the effect. When the CO2 levels drop, plant production of O2 drops, allowing the CO2 level to rise again... and so on. This makes the projection of our current increase based on a 50 year sample suspect.

But with a change in O2 of two tenths of a percent in 50 years, even if the trend is accurate, I don't think I will be gasping for breath any time in the next few thousand years.
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