Most recorded events appear to be linked with cooling episodes of the Holocene and a RSL close to present. (kaltesonne.de)
Though the evidence seems firmly against the idea of stand - wide missing rings as the explanation, the potential model - data discrepancy during volcanic cooling episodes is certainly an issue worth airing. (realclimate.org)
In the past, these traits have been particularly useful at helping birds and mammals disperse around the world during periods of global cooling, the researchers point out, including a major cooling episode that occurred around 34 million years ago. (scientificamerican.com)