Make sure of your next Birthday

Manipulating one's life through some basic school maths, 
Total Population on earth                           = 7.08 billion
Trees Available on earth (NASA)                = 400,246,300,201 (400 billion)
Using unitary method,
Trees available per person                         = 400.246/7.08 ~= 61
Air 1 person breathes (in a year)                 = 9.5 tonnes of air
O2 1 person breathes (in a year)                 = 0.23*9.5 tonnes 
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