Can we analyze observations cleverly so as to separate forced from internal variations, with or without the use of models? (gfdl.noaa.gov)
Thus the climate is capable of producing long time - scale internal variations of considerable magnitude without any external influences. (judithcurry.com)
These simple trendlines provide visualization of the underlying long - term interglacial trends and removes medium and short - term internal variations as well as noise. (co2coalition.org)