claim: the temperature increase in the second half of the 20th century could have taken place in steps driven by major ENSO events ( Jens Raunsø Jensen )
evidence: For example, one of the most recent results, even after subtracting the positive influence of decadal variation, is shown to be possibly present in the ENSO trend, the amplitude of the ENSO variability in the observed data still increases, by as much as 60% in the last 50 years.