Planet 0 Humans -500; Extra Time Limited

At last I have found a use for football,
it gives me a unit of measurement for the rate
of the slow but clear advance of the sixth extinction.
Who would have thought that a game
played in schools to 'use up spare energy'
in primary school pupils would have such
a powerful existential afterlife?
As unit of measurement for the removal
of generous, quiet, life-giving ancient 
forest all there is left to ask is how many
trees can grow on an area the size of
a football field. Please left click here
for one answer. Though what disturbs 
me is next uncalculated question,
the number of tree years in each football field's
worth of virgin Amazonian forest chopped down.  
For this there is only one answer; too many,