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"An old rule says that climate-relevant trends should not be calculated for periods less than around 30 years," said Thomas Stocker, co-chair of the group that wrote the report.
Well that's a nice "rule of thumb" and all but one would think that with the ever increasing use of fossil fuels, including during that "15 year hiatus from rising temps", that if we had such a direct impact on global warming, the numbers would have continued to rise. It's not like the world suddenly started burning less oil, coal and wood before that 15 year period.