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Life began on Earth at least 4 billion years ago, possibly beside hot underwater springs. It has been suggested, as past of the 'Gaia hypothesis', that life acts as a regulator on the Earth's temperature, keeping it within tolerable limits bu adjusting the balance of gases in the atmospere. However, there are growing signs of a human-induced global warming upsetting any natural balance by industrial and agricultural release of greenhouse gases such as carbon dioxide and methane.
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