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Research by Thompson and Solomon (2002)  and by Shindell and Schmidt (2004)  provide explanations for the observed cooling trend during the 1970s through 2000. An updated paper by Thompson et al. (2012)  emphasized that this explanation only applies to austral summer; during the fall, winter and spring seasons, the mean trend is warming, and this is believed to be largely due to changes in atmospheric circulation related to warming trends in the tropical Pacific region. 
I usually write everything down using pen and paper.