Trees produce oxygen:
A mature leafy tree produces as much oxygen in a season as 10 people inhale in a year.
A Tree's Importance and Environmental Benefit
By Steve Nix, About.com
Eight Reasons to Plant Trees | Trees Produce Oxygen
German Tree Plantation
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- The Urban Tree Book
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- Eight Reasons to Plant Trees | Trees Produce Oxygen
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Tree Value, Importance, Benefits
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