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During photosynthesis, plants absorb carbon dioxide from the air and transform it into sugars, carbohydrates, and other carbon-based molecules.Some of those carbon products transfer from the roots to symbiotic fungi and soil microbes, which store the carbon in soil as humus.
There were indications of settlement after 9,000 B. For a decade, researchers from the Florida Museum of Natural History have been excavating the Page-Ladson site, and this past fall  they uncovered the ground surface of a Paleoindian habitation at a depth of 15 feet.Animal husbandry made things worse, as domesticated animals began grazing grasslands down to the earth.In places wehere the ground is bare - from overgrazing or from the common practice of leaving fields unplanted for part of the year - photosynthesis stops. Lal calculates that land use changes such as these have stripped 70 billion to 100 billion tons of carbon from the world's soils and pumped it into the earth's atmosphere, oceans, and lakes since the dawn of agriculture. - Geography Trivia / Ireland - "The shape and landscape of present-day Ireland—an island of 27,100 square miles [70,200 square kilometers]—were formed 10,000 years ago when Atlantic Ocean glaciers slowly began their retreat.[NP] The invention of agriculture some 10,000 years ago disrupted these ancient soil-building processes.When humans started draining and plowing up the natural topsoil for planting, they exposed the buried carbon to oxygen, creating carbon dioxide and releasing it into the air.
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World population was at a few million people, likely below 5 million. Less than a year after these results were published another study showed that the stone circles had been preceded by wooden circles of 6-metre pine 'totem poles' dated to 8,000 B. [Based on: by Graham Hancock and Santha Faiia, Heaven's Mirror, Quest For The Lost Civilization, p. C.] in which herding and agriculture came into use, is called the 'New Stone Age' or [in Latin] the 'Neolithic Age.' "8,000 B. - Civilization / Ur - "The Ur culture developed during the Neolithic Age and became global in expanse by 8,000 B. According to popular belief: 'Where the Sumerians came from is still disputed.