April 19th, 2009 by Roy W. Spencer, Ph. D.
This graph is not a trick�it looks different from what you are used to seeing because CO2 is usually plotted with a greatly magnified vertical scale to make the CO2 rise look more dramatic. Yes, we might double the CO2 concentration of the atmosphere by late in this century�but 2 times a very small number is still a very small number.
ISN�T IT WARMER NOW THAN IT HAS BEEN IN THOUSANDS OF YEARS?
Well, look at the following recently published proxy reconstruction of global temperatures over the last 2000 years. This graph is based upon 18 previously published temperature proxies, and so provides the most robust estimate available to date. It can be seen that significant warming and cooling periods of 50 to 100 years in duration seem to be the rule, rather than the exception. There were probably even warmer years during the Medieval Warm Period (MWP) than we have seen in recent years.
http://www.drroyspencer.com/2009/04/some-global-warming-qa-to-consider-in-light-of-the-epa-ruling/
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