text: Simulations using several IPCC-class general circulation models (GCMs) are used to demonstrate that the adjustment to climate change itself takes place over decadal timescales, meaning that ENSO response is not statistically significant during the 21st century. This implies that current model intercomparisonexperiments are insufficient to measure the true range of ENSO climate sensitivity. However, significant changes to atmospheric teleconnectionsmay take place within the 21st century: the NCARCommunity Climate System Model version 4 (CCSM4), for example, predicts harsher winters in the Southwestern US during La Nia and weaker Australian teleconnections during both El Nio and La Nia.