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Only in the first 10 years of a trees life does in produce more oxygen than it takes in.
But more importantly:
"When a tree dies, it releases its stored carbon back into the air. The death and rotting of one 70-year-old tree would return over 3 tons of carbon to the atmosphere."
The really big O2 producer on our planet is not the tree but the tons and tons of algae in our oceans.Richy, 15 years ago.