## Tuesday, February 05, 2008 ... //

### The Arctic cooling since 500 AD

In this weekly dose of peer-reviewed skeptical literature about the climate, we look into Climate Dynamics.

Håkan Grudd
applies somewhat esoteric statistical methods to data extracted from Northern Swedish trees (in Torneträsk) to conclude that the late 20th century wasn't exceptionally warm.

The decades around 750, 1000, 1400, 1750 AD were comparably warm and the whole bi-centennial period around 1000 AD was clearly warmer than the late 20th century: at the 95% confidence level. See also
World Climate Report