Re "local climate changes," -- the locales
moved, for cryin' out loud. That's why we have fossil evidence of dinosaurs and some somewhat more modern biota in Antarctica.
please read re "Continental Drift" and "plate tectonics" --
...and I find it very hard to give any credence to OISM: Its so-called "faculty" have their interests engaged so widely -- from "Civil Defense" strategies to YetAnotherVariant of homeschooling -- that it's difficult for me to take them or their assertions seriously ... and, in any case, the paper you cite argues heavily on the basis of short-term ( eg: post-1940 ) trends while largely ignoring the fact (substantiated by ice cores worldwide and bio-data such as that from well-dated tree samples, etc) that the current, significant increase in atmospheric CO2 began with the Industrial Revolution.
But... this is the last from me on this topic. TedPride is NOT a troll, nor, I hope, am I, but we have very widely divergent views of the available data, hypotheses, and conclusions, and this is really far OT, IMO.