To simplify construction of basic formulas and understanding/ am converting all to btu's and then extending btu's by the appropriate or suspected air to fuel ratios to obtain a basic volume required by fires across the world

To begin the analysis of oxygen consumption, the use of fuel consumption is primary to the construction of basic analysis. Total refined oil fuels for 2004 are 82.97 million barrels per day, plus roughly an addition 4 million barrels used in refinery process = 87 million barrels per day. Yearly rate is 3462.4 million tonnes. This would be 3,654,000,000 gal (us) per day or times 365.25 = 1,334,623,500,000 gallons per year. Divided by 200 gallons the equivalent of 28,000,000 btu's = 6,673,117,500 tons of coal at 28,000,000 btu's per ton. Or at 140,000 btu's per us gallon it would be = 186,847,290,000,000,000 btu's total At the burn rate of 6 parts air (gallons, for volume) to one part fuel (gallons) the oil consumption requires a volume of air equivalent to = 5,052,099,812.38 cubic meters times 6 = an approximate air volume of 30,312,598,872 cubic meters Or 1,070,479,311,202 cubic feet

Natural gas consumption for the year 1999 in billion cubic meters for the world is 2292.6. This converts to 80,962,403,759,147 cubic feet/ at 1,028,000btu's per 1000 cubic feet or 83,229,351,065,200,000 btu's (rounded off) Converted to At the burn rate of 14 parts air to one part fuel, the gas consumption requires a volume of air equivalent to 1,165,210,914,000,000,000 cubic feet (rounded off)

Coal consumption worldwide 1999 86.8 quadrillion btu's. In million tonnes oil equivalent 2129.5 converted to cubic feet of natural gas by dividing 86.8 quadrillion btu's by 1,028,000/ 1000 cubic feet. it becomes 84,435,797 cubic feet at a burn rate of 10 Parts air to one part fuel the coal consumption requires a volume of air equivalent to 844.35 quadrillion cubic feet.

The consumption of wood & waste in 1999 Is stated as 3.514 quadrillion btu's. Converted to btu's per cubic feet = 8,773,854,545 cubic feet. At a burn rate of 10 Parts air to one part fuel, the wood and waste requires a volume of air equivalent to 87,738,545,450 cubic feet of air

The consumption of fire from forests, intentional burns, and the like not included from around the world is likely to be somewhere around 3 billion people using one cooking fire every day generating 1000 btu's would be equivalent to 3 trillion btu's a day times 365.25 = 1,095,750,000,000 btu's per year or 1,056,616,071 cubic feet. At a burn rate of 10 Parts of air to one part of biomass requires a volume of air equivalent to 10,566,160,710 cubic feet of air

added together these fuels represent an air volume of roughly 117,366,610,184,000,000 cubic feet per year using mostly 1999 statistics for the fuels we burn with oxygen from the atmosphere. Therefore the "green earth" must replace this volume of air at its current 21% saturation of oxygen or we are losing oxygen/ and will suffer for it.

Returning to the expected 60 % land mass that creates our green earth or a land area of 106,511,764,000 sq yards (roughly). At 3feet off the ground this becomes 2,875,817,594,147,153 cubic feet. Or with these figures are oxygen requirements for fuel burning are using up the first 120 feet in height of the atmosphere from the green earth for fire. This is 120 feet above the green earth. Or that 60% of the land that actually produces oxygen. I do not know how fast the median property with the median plants upon it reproduce oxygen, therefore you will need to find this statistic before we can proceed. However it is fair to assume consumption of oxygen at this rate is depleting our ability to live/ as all life must "find their air above the current 120 feet, to survive,{do we and all life, not have to breathe?} this is a yearly amount used for fire". The atmosphere around the earth with oxygen in it for at least 40,000 feet, this is supporting us/ but we are removing our life source, by consuming more than the earth produces: think about it. A secondary issue oxygen is just slightly heavier than nitrogen the most common element of air, the ability of oxygen to "sink to our level" does become an issue eventually, that we might use it. This is a complex formula, which is not necessary in this disclosure/ do study it however, because the reality will come.

The production of carbon dioxide worldwide shows a continual rise except for the year 2001 a slight reduction statistics for 2002 5,729.3 million metric tons . As a measure of total atmospheric content over time/ Production of carbon and the consequent rise in atmospheric increases indicates plant uptake/ thereby plant usage or the lack of sufficient plant material to use it up. This would also be an indicator over time of oxygen consumption; in addition to specific oxygen content at various levels in the atmosphere. Because it is heavier, natural progression should affect the upper levels first. Kindly investigate.