Improved constraints on 21st-century warming derived using 160 years of temperature observations   Publication Date:   2012 Creator:   N.P. Gillet V.K. Arora G.M. Flato J.F. Scinocca K. von Salzen Publisher.Display:   American Geophysical Union Subjects.Display:   Climate change Global warming Greenhouse gases surface air temperature of the earth Source Institution:   Florida International University Improved constraints on 21st-century warming derived using 160 years of temperature observations