Abstract
Chris Reinhard and Kazumi Ozaki at the Georgia Institute of Technology in Atlanta and their colleagues suggest that a major contributor to greenhouse effect was methane generated by primitive microorganisms that had evolved to photosynthesis. Photosynthesis is the process by which green plants and many microbes sustain themselves. The researchers modelled the microbes and their primitive biosphere by including factors such as the amount of hydrogen spewed from volcanoes, carbon dioxide levels in the atmosphere, the burial rate of iron and organic matter on the sea floor, and the breakdown of methane by the sun's ultraviolet rays.
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