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When is
it a fact trees are important for our survival, many people wonder of how
much really a tree can contribute to the human species. Trees produce oxygen
which is what humans inhale as well as they inhale carbon dioxide which is what
humans create. The trees need us as we need them. We both wouln't be able to
survive without the other. The amount of oxygen produced by a tree depends on
several factors, but here are some typical calculations.
The atmosphere of the Earth has a different composition from
that of other planets in part due to the biochemical reactions of Earth's
organisms. Trees and plankton play a big role in this. There are different
answers for this and many people who have come to different answer but the
truth is a tree is plays a mayor role in the survival of more than 1 human. The
amount of oxygen produced by a tree depends on the species of tree, its age,
its health, and also on the tree's surroundings. According to the Arbor Day
Foundation, "a mature leafy tree produces as much oxygen in a season as 10
people inhale in a year." Here are some other quoted figures regarding the
amount of oxygen produced by a tree:
"A
single mature tree can absorb carbon dioxide at a rate of 48 lbs./year and
release enough oxygen back into the atmosphere to support 2 human beings."
- McAliney, Mike. Arguments for Land Conservation: Documentation and
Information Sources for Land Resources Protection, Trust for Public Land,
Sacramento, CA, December, 1993
"One
acre of trees annually consumes the amount of carbon dioxide equivalent to that
produced by driving an average car for 26,000 miles. That same acre of trees
also produces enough oxygen for 18 people to breathe for a year."
- New York Times
" A 100-ft tree, 18" diameter at its base, produces
6,000 pounds of oxygen."
"On
average, one tree produces nearly 260 pounds of oxygen each year. Two mature
trees can provide enough oxygen for a family of four."
- Environment Canada, Canada's national environmental agency
"Mean net annual oxygen production (after accounting for
decomposition) per hectare of trees (100% tree canopy) offsets oxygen
consumption of 19 people per year (eight people per acre of tree cover), but
ranges from nine people per hectare of canopy cover (four people/ac cover) in
Minneapolis, Minnesota, to 28 people/ha cover (12 people/ac cover) in Calgary,
Alberta."
- U.S. Forest Service and International Society of Arboriculture joint
publication
Source: about.com
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