Most previous estimates of the magnitude of unforced variability have come from physical climate models. (patricktbrown.org)
However, this lower estimate could mostly be attributed to Schmittner et al.'s low estimate of the glacial - interglacial temperature change, of just 2.6 °C globally (most previous estimates put the value at around 5 °C). (skepticalscience.com)
With this data, the WMAP research team calculated that the universe is 13.7 billion years old (plus or minus 1 percent) and determined that the first stars appeared 200 million years after the Big Bang, far earlier than most previous estimates. (discovermagazine.com)