NRSP Allied Scientist Dr. Tim Ball analyzes the following excerpt from the CBC Web piece “Global warming explained”

“Eleven of the highest average global annual temperatures recorded since 1861 have come in the past 12 years.”

By Dr. Ball:

There is confusion here. The Goddard Institute of Space Studies (GISS), the authority for global temperatures, were advised of an error in their calculations for US data. They very quietly changed the data so that 1934 became the warmest year in the record, not 1998. It also changed the claim that 9 of the 10 warmest years were in the most recent decade. It also changes the global numbers because U.S. data dominates the world data as evidenced by the density of the stations in the U.S. as indicated in the following map.

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