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The climate-modeling problems associated with global change underline the importance of understanding paleoclimates. The available evidence, which suggests that the Earth has never been fully glaciated, poses an especially serious problem for the early Earth when the Sun was about 20–30% fainter than today. In conventional explanations of this "faint young Sun paradox", presumed very high levels of atmospheric greenhouse gases are required to prevent runaway glaciation of the Earth. Here wedoi:10.3189/s0022143000017780 fatcat:o27o7hy4wvh63bcqjzdsjhsgfm