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Some factoids (mostly from the IPCC). Although the total annual averageNot sure that 'feedback' is the right term here. The rise and fall of CO-2
insolation remains constant for the earth over hundreds of thousands of
years (even including orbit changes- and changes in sun intensity occur
much slower), the LOCAL change at 60deg latitude is a seasonal variation
of around ~400W/m^2. It is this LOCAL variance which is thought to give
rise to changes from ice age to interglacial (carbon dioxide appears to
act as a feedback mechanism for this change, rising in warm climates and
falling in cool climates).