/sci/ - Science & Math

Mann (2008) is NOT the hockey stick, that was a decade earlier.

From the diagram, the Medieval Warm Period and Little Ice Age have disappeared, to be replaced by a largely benign and slightly cooling linear trend in climate - until 1900 AD. At that point, Mann completed the coup and crudely grafted the surface temperature record of the 20th century (shown in red and itself largely the product of urban heat islands) onto the pre-1900 tree ring record. The effect was visually dramatic as the 20th century was portrayed as a climate rocketing out of control.

The red line extends all the way to 1998 (Mann's 'warmest year of the millennium'), a year warmed by the big El Niño of that year. It should be noted that the surface record is completely at variance with the satellite temperature record. Had the latter been used to represent the last 20 years, the effect would have been to make the 20th century much less significant when compared with earlier centuries.

If the Medieval Warm Period was warmer than today, with no greenhouse gas contribution, what would be so unusual about modern times being warm also? If the variable sun caused both the Medieval Warm Period and the Little Ice Age, would not the stronger solar activity of the 20th century account for most, if not all, of the claimed 20th century warmth?

more at www.john-daly.com/hockey/hockey.htm