Early earth may have been prone to deep freezes

  Early earth may have been prone to deep freezes, says Cu-Boulder study   Two University of Colorado Boulder researchers who have adapted a three-dimensional, general circulation model of Earth’s climate to a time some 2.8 billion years ago when the sun was significantly fainter than present think the planet may have been more prone to catastrophic glaciation than previously believed. The new 3-D model of the Archean Eon on Earth that lasted from about 3.8 billion years to 2.5 ... Full Story