For example, they show that the modern instrumental record averaged only
over their 14 sites captures the
full Northern Hemisphere mean temperature variations remarkably well
over the available (approximately 150
years)
interval.
Note that for each data set, the
full - sample (about 30
years) trend is within the confidence
interval of the 10 -
year trend — so there's no evidence, from any of the data sets, that the trend
over the last decade is different from the modern global warming trend.