Here is some evidence that the earth at one time had increased oxygen levels which is one explanation for the increased life spans in the biblical times. Other theories to consider are increased nutrients in food (no cardboard tasting tomatoes); and less radiation due to dense canopy.
From Genesis Park Website
Another interesting feature of the early earth atmosphere was enhanced oxygen. "The Earth’s atmosphere 80 million years ago contained 50 per cent more oxygen than it does now, according to an analysis of microscopic air bubbles trapped in fossilized tree resin. The implications of the discovery - if confirmed by more experiments - are enormous. One implication is that the atmospheric pressure of the Earth would have been much greater during the Cretaceous era, when the bubbles formed in the resin. A dense atmosphere could also explain how the ungainly pterosaur, with its stubby body and wing span of up to 11 meters, could have stayed airborne, he said. The spread of angiosperms, flowering plants, during the Cretaceous era could have caused the high oxygen levels reported by Berner and Landis, scientists said last week." (Anderson, Ian, "Dinosaurs Breathed Air Rich in Oxygen," New Scientist, vol. 116, p. 25. Cited in The Modern Creation Trilogy by Morris) Some have even suggested that without such an atmosphere the relatively small lung capacity in certain dinosaurs could not have supplied their massive tissue with the needed oxygen.
Other interesting feature of the early earth atmosphere was enhanced oxygen and a denser atmosphere. Robert Berner of Yale and Gary Landis of the U.S. Geological Survey analyzed air bubbles that are believed to have been trapped in amber some 80 million years ago. "The researchers clamped the amber into a vacuum chamber of a quadrupole mass spectrometer, a device that identifies the chemical composition of a substance. As the machine slowly crushed the sample, the microscopic bubbles were released, exhaling up to 100 billion molecules. These breaths disclosed some surprising evidence: the ancient air contained 50 percent more oxygen than the air today."
http://www.genesispark.org/genpark/flood/flood.htm
From Genesis Park Website
Another interesting feature of the early earth atmosphere was enhanced oxygen. "The Earth’s atmosphere 80 million years ago contained 50 per cent more oxygen than it does now, according to an analysis of microscopic air bubbles trapped in fossilized tree resin. The implications of the discovery - if confirmed by more experiments - are enormous. One implication is that the atmospheric pressure of the Earth would have been much greater during the Cretaceous era, when the bubbles formed in the resin. A dense atmosphere could also explain how the ungainly pterosaur, with its stubby body and wing span of up to 11 meters, could have stayed airborne, he said. The spread of angiosperms, flowering plants, during the Cretaceous era could have caused the high oxygen levels reported by Berner and Landis, scientists said last week." (Anderson, Ian, "Dinosaurs Breathed Air Rich in Oxygen," New Scientist, vol. 116, p. 25. Cited in The Modern Creation Trilogy by Morris) Some have even suggested that without such an atmosphere the relatively small lung capacity in certain dinosaurs could not have supplied their massive tissue with the needed oxygen.
Other interesting feature of the early earth atmosphere was enhanced oxygen and a denser atmosphere. Robert Berner of Yale and Gary Landis of the U.S. Geological Survey analyzed air bubbles that are believed to have been trapped in amber some 80 million years ago. "The researchers clamped the amber into a vacuum chamber of a quadrupole mass spectrometer, a device that identifies the chemical composition of a substance. As the machine slowly crushed the sample, the microscopic bubbles were released, exhaling up to 100 billion molecules. These breaths disclosed some surprising evidence: the ancient air contained 50 percent more oxygen than the air today."
http://www.genesispark.org/genpark/flood/flood.htm
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