Study: No warming signal found in study of frozen ground changes over past ~ 20 years
'A paper published today in Env. Research Letters examines a 71 year history of seasonally frozen ground changes in Eurasia. The paper finds freeze depths decreased (indicative of warming) between late 1960's to early 1990's, but that "from that point forward, likely through at least 2008, no change is evident.' Finds observed changes linked to N. Atlantic Oscillation (NAO), a natural climate cycle, rather than the uncorrelated steady rise in 'greenhouse gases.'