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1989; Phillipps and Held, 1994). Either the models are
incomplete or orbitally induced solar insolation variations are at
best only a catalyst for glacial/interglacial changes. Both of
these conclusions have important implications for global change
projections: the former implies that contemporary GCMs might not be
sufficiently sensitive to solar radiative forcing (whether of
orbital or solar activity origin), while the latter emphasizes that
it is the climate system feedbacks that are most important in
producing climate change, invalidating the use of simple transfer
functions between radiative forcing perturbations and climatic