How is interdecadal-to-centennial natural variability taken into account in the IPCC GCMs projections?

This low-frequency natural variability might hide or intensify the climate system response to increased greenhouse gases in the atmosphere. In fact, for the next 30 years it seems that interdecadal natural variability would play a major role in the expected changes of rainfall and temperature in many regions, for instance, in South America.

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