A Geological Perspective of Polar Bears

Guest “geological perspective” by David Middleton A Popular Narrative Polar bears (Ursus maritimus) are the poster child for the impacts of climate change on species, and justifiably so. To date, global warming has been most pronounced in the Arctic, and this trend is projected to continue. There are suggestions that before mid-century we could have…

On certainty: Truth is the Daughter of Time

This comment from Dr. Robert Brown at Duke University is elevated from a comment to a full post for further discussion. Since we have a new paper (Shepherd et al) that is being touted in the media as “certain” using noisy data with no stable baseline, this discussion seems relevant. rgbatduke says: December 2, 2012…

Dusting for Fingerprints in the Holocene

Guest Post by David Middleton Fingerprints are admissible evidence in criminal trials because of their uniqueness. The probability of two human beings having identical fingerprints is very low. Measurements of δ13C depletion have often been cited as anthropogenic “fingerprints,” proving human culpability for the rise in atmospheric CO2 over the last 200 years or so……