A human - caused warming signal is embedded in the rich, year - to - year and decade - to - decade noise of natural internal climate variability. (dotearth.blogs.nytimes.com)
Perhaps forty are needed for a particular location to address internal climate variability. (realclimate.org)
This result is another link in a growing chain of evidence that internal climate variability played leading order role in the trajectory of 20th century global mean surface temperature. (pnas.org)