Referring to figure 3 on page 182 in Weart, how would you argue that we have entered a time of anthropogenic warming?  If you had been living in the 16th to 19th centuries and had the data of figure 3 to that point in time how would you argue the possibility of climate change?  Extrapolating a story from climate change data is difficult because there is a great deal of variability involved.  Weather and temperature change constantly so exact numbers often fade to averages and estimates.  The further back in history one explores, the more uncertainty there will be simply because of less technology and attention paid to the subject.  However, through ice, pollen, soil, and fossil samples, scientists have pieced together the story of earth’s climate.  The graph on page … Read entire article »