Bradley, R.S., 1996: Are there optimum sites for global paleotemperature reconstruction? (geo.umass.edu)
Our global paleotemperature reconstruction includes a so - called «uptick» in temperatures during the 20th - century. (dotearth.blogs.nytimes.com)
In North America the Post-Roman-Carolingian Period was marked by warm temperatures in the northern parts, with mean paleotemperatures in central Canada about 1 ° C above the present. (britannica.com)