But a new analysis of tree ring samples collected in Bolivia, Cameroon, and Thailand finds no sign of increasing growth over the past 150 years. (sciencemag.org)
In a 2012 study, Williams and his colleagues looked at past tree ring samples from the Southwest in the context of both past droughts and climate model projections of VPD. (ensia.com)
By the time I returned to UB the next morning, Hessl had emerged from the field with about 140 new tree ring samples. (discovermagazine.com)