n Figure 1, we show global average temperature anomalies for the period 1881 to 1990.[9] If we fit a linear trend line through the data, we find that global average temperature has increased by .56 degrees centigrade. However, over this same period, equivalent carbon dioxide levels have increased by about 40 percent. Assuming that there is a relationship between carbon dioxide levels and temperature change, this would imply an increase in temperature of about 1.4 degrees for a doubling of carbon dioxide levels, which is below the temperature range predicted by the climate models reported by Balling.