For a very short time scale (such as ENSO) variablility averages out over decades. (realclimate.org)
Here we propose that increasing variablility within the past million yearsmay indicate that the climate system was approaching a second climate bifurcation point, after which it would transition again to a new stable state characterized by permanent mid-latitude Northern Hemisphere glaciation. (dotearth.blogs.nytimes.com)
Is this another example of ««natural variablility, but the long - term trend will be obvious.. (wattsupwiththat.com)