article_snippet.sent: Global warming hasn't happened as fast as expected, according to a new study based on 1,000 years of temperature records.
article_snippet.sent: a new study based on 1,000 years of temperature records claims that natural variability in surface temperatures over the course of a decade can account for increases and dips in warming rates.
article_snippet.sent: But a new study based on 1,000 years of temperature records adds that these so-called 'climate wiggles' could also, in the future, cause our planet to warm up much faster than anticipated.
article_snippet.sent: a new study based on 1,000 years of temperature records, however, says this climate model may be wrong .
article_snippet.sent: Based on our analysis, a middle-of-the-road warming scenario is more likely, at least for now,' said Patrick Brown, a doctoral student in climatology at Duke University. '
article_snippet.sent: a new study based on 1,000 years of temperature records says that variability is caused by interactions between the ocean and atmosphere, and other natural factors.
article_snippet.sent: a new study based on 1,000 years of temperature records claim these 'wiggles' can slow or speed the rate of warming from decade to decade, and exaggerate or offset the effects of increases in greenhouse gas concentrations.
article_snippet.sent: If not properly explained and accounted for, a new study based on 1,000 years of temperature records may skew the reliability of climate models and lead to over-interpretation of short-term temperature trends.
article_snippet.sent: Because 'climate wiggles' were not accounted for, a new study based on 1,000 years of temperature records
article_snippet.sent: Duke University say a previous IPCC report may have been an over-interpretation of short-term temperature trends .
article_snippet.sent: The research, uses observed data, rather than the more commonly used climate models, to estimate decade-to-decade variability. '
article_snippet.sent: At any given time, we could start warming at a faster rate if greenhouse gas concentrations in the atmosphere increase without any offsetting changes in aerosol concentrations or natural variability,' said Wenhong Li, assistant professor of climate at Duke, who conducted the study with Brown.
article_snippet.sent: Professor Brooks, who is affiliated with the University of Nebraska-Lincoln examined whether climate models, such as those used by the IPCC, accurately account for natural chaotic variability that can occur in the rate of global warming.
article_snippet.sent: To test these, created a new statistical model based on reconstructed empirical records of surface temperatures over the last 1,000 years. '
article_snippet.sent: By comparing our model against our, our found that climate models largely get the 'big picture' right but seem to underestimate the magnitude of natural decade-to-decade climate wiggles,' Brown said. '
article_snippet.sent: our model against theirs shows these wiggles can be big enough that these wiggles could have accounted for a reasonable portion of the accelerated warming our experienced from 1975 to 2000, as well as the reduced rate in warming that occurred from 2002 to 2013.' '
article_snippet.sent: There's no guarantee, however, that this rate of warming will remain steady in coming years, Li stressed. '
article_snippet.sent: Our analysis clearly shows that we shouldn't expect the observed rates of warming to be constant.
highlights_snippet.sent: Duke University study looked at 1,000 years of temperature records .
  
highlights_snippet.sent: Found that natural variability can slow or speed the rate of warming .
  
highlights_snippet.sent: These 'climate wiggles' were not properly accounted for in the IPCC report .