Graham Lloyd at The Australian has now put it at 20 years:
DEBATE about the reality of a two-decade pause in global warming and what it means has made its way from the sceptical fringe to the mainstream.This is flat-out wrong -- warming over the last 20 years has been about 0.3°C.
- Over the last 20 years, GISS shows a warming trend of 0.15 ± 0.02 C/decade, or 0.30°C for two decades.
- HadCRUT4 has it at 0.136 ± 0.014 C/decade, or 0.27°C for two decades.
Can anyone stretch this lie out to 25 years?
P.S.: Yesterday HadCRUT4 just reported their surface anomaly for February: the 9th-warmest February in 165 years. Some haitus. Even their 15-yr trend is 0.05 ± 0.02 C/decade, and rising fast as the 1997-98 El Nino falls out the back-end of the 15-yr interval, and it's for suckers.