Looks like about 20%. Most of our worldwide O2 comes from phytoplankton, but rainforests are the main land O2 producer. See sites below.
Climate Control
Tropical forests do not only provide goods, but invaluable services, as well. They are vital to the hydrologic cycle (rain and water systems), and they maintain some of the world's most fragile soils. Forests are one of the world’s primary carbon reservoirs, storing an estimated 610 billion tons of carbon. By absorbing carbon dioxide from the air, storing the carbon and giving us fresh, clean oxygen, tropical forests act as the world’s thermostat, regulating temperatures and weather patterns. More than 20% of the world’s oxygen is produced by the Amazon rainforest. Excess carbon dioxide produced by cars, industry and uncontrolled logging and burning in tropical forests are the major source of global warming, which is heating the planet even faster than scientists had predicted just a few years ago.
Responsible forestry helps us to turn down the global thermostat. By stopping the destruction of mature (old-growth) forests, we keep a huge amount of carbon from being released into the atmosphere, and by promoting Earth-friendly planting and management of young forests, we absorb large amounts of atmospheric carbon.
2007-03-06 02:44:59
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answer #1
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answered by Frank 3
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Don't forget that as well as producing oxygen tropical rainforests also produce a lot of CO2 as the vegetation decays on the forest floor. Very little organic matter is absorbed into the soil, which is typically thin and poor (unlike temperate latitudes). There are suggestions that under some circumstance the forest can become a net emitter of CO2 http://www.sciencedaily.com/releases/2006/06/060621084137.htm Clearly there is a lot of carbon locked up in a tropical rainforest and a large amount of CO2 can be released when a rainforest is burnt. See also http://en.wikipedia.org/wiki/Carbon_sequestration To sum up a mature rainforest is normally carbon neutral and they are not net emitters of oxygen.
2007-03-06 03:21:13
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answer #2
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answered by Robert A 5
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This Site Might Help You.
RE:
What percent of the oxygen on Earth is produced by the rainforests?
I need to write a persuasive essay for school, and this a fact I need. Please help!
2015-08-18 15:22:34
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answer #3
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answered by Conception 1
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It's located in the north eastern part of South America. Mainly in Brazil, but parts extend into Bolivia, Peru, Ecuador, Guyana, Suriname, French Guiana, and Columbia.
2016-03-18 09:29:29
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answer #4
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answered by Anonymous
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For the best answers, search on this site https://shorturl.im/avAJG
20% is from the amazon and about 12-15% from all other rain forest's
2016-04-06 02:37:28
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answer #5
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answered by Anonymous
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Search google
2007-03-13 00:05:23
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answer #6
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answered by Anonymous
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Fact: More than 20 percent of the world's oxygen is produced by the Amazon rainforest (not all the rainforest in the world)
other facts:
Facts about the Global Coverage of Rainforests:
Fact: Covering less than 2 percent of the Earth's total surface area, the world's rainforests are home to 50 percent of the Earth's plants and animals.
Fact: Rainforests can be found all over the world from as far north as Alaska and Canada to Latin America, Asia and Africa.
Fact: Rainforests are found on every continent across the Earth, except Antarctica.
Fact: There are two major types of rainforest: temperate rainforests and tropical rainforests.
Fact: The largest temperate rainforests are found on North America's Pacific Coast and stretch from Northern California up into Canada.
Fact: Temperate rainforests used to exist on almost every continent in the world, but today only 50 percent – 75 million acres – of these forests remain worldwide.
Facts about the Rainforest as Part of our Global Environment and Well-being:
Fact: Rainforests act as the world's thermostat by regulating temperatures and weather patterns.
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Fact: One-fifth of the world’s fresh water is found in the Amazon Basin.
Fact: Rainforests are critical in maintaining the Earth's limited supply of drinking and fresh water.
Facts about the Abundant Life and Important Resources that Rainforests Share with Us:
Fact: A typical four square mile patch of rainforest contains as many as 1,500 flowering plants, 750 species of trees, 400 species of birds and 150 species of butterflies.
Fact: Rainforests provide many important products for people: timber, coffee, cocoa and many medicinal products, including those used in the treatment of cancer.
Fact: Seventy percent of the plants identified by the U.S. National Cancer Institute as useful in the treatment of cancer are found only in rainforests.
Fact: More than 2,000 tropical forest plants have been identified by scientists as having anti-cancer properties.
Fact: Less than one percent of the tropical rainforest species have been analyzed for their medicinal value.
Facts about the Threats to Rainforests, Indigenous People and Species:
Fact: Rainforests are threatened by unsustainable agricultural, ranching, mining and logging practices.
Fact: Before 1500 A.D., there were approximately 6 million indigenous people living in the Brazilian Amazon. But as the forests disappeared, so too did the people. In the early 1900s, there were less than 250,000 indigenous people living in the Amazon.
Fact: Originally, 6 million square miles of tropical rainforest existed worldwide. But as a result of deforestation, only 2.6 million square miles remain.
Fact: Tropical deforestation results in the loss of 100 species per day.
Fact: At the current rate of tropical forest loss, 5-10 percent of tropical rainforest species will be lost per decade.
Fact: Nearly 90 percent of the 1.2 billion people living in extreme poverty worldwide depend on forests for their livelihoods.
Fact: Fifty-seven percent of the world’s forests, including most tropical forests, are located in developing countries.
Fact: Every second, a slice of rainforest the size of a football field is mowed down. That's 86,400 football fields of rainforest per day, or over 31 million football fields of rainforest each year.
Fact: More than 56,000 square miles of natural forest are lost each year.
2007-03-12 14:20:17
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answer #7
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answered by jason m 4
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