Duke University researchers looked at 1,000 scenarios of temperature change . It compared it to the most severe emissions scenarios by the 1990s . Found that natural warming can slow or speed the progression of warming . These ' warming wiggles ' were not properly accounted for in IPCC studies .
Duke University study looked at 1,000 years of temperature records . It compared it to the most severe emissions scenarios by the IPCC . Found that natural variability can slow or speed the rate of warming . These 'climate wiggles ' were not properly accounted for in IPCC report .