Why the Earth's surface was not one big lump of ice four billion years ago when sun radiation was much weaker than today
Wednesday, March 31, 2010 - 15:14
in Astronomy & Space
Scientists have solved one of the great mysteries of our geological past: Why the Earth's surface was not one big lump of ice four billion years ago when sun radiation was much weaker than today. Scientists have presumed that the Earth's atmosphere back then consisted of 30 percent CO2 trapping heat like a greenhouse. However, new research shows that the reason for Earth not going into a deep freeze at the time was quite different.