Other factors may be less predictable, like deserts have comparatively high albedo and forests, lower albedo and the Sahara, for example, becomes partially forested over depending on variations in weather patterns driven primarily by Milankovich cycles (not necessarily in sync with ice age cycles), but I suspect, compared to the ice and ocean surface area changes, desert to forest changes have less effect.

Today's global warming is expected to (and already has) decreased ice and show cover, which lowers albedo and this trend is expected to continue. Over time, enough glacial ice might melt that oceans become measurably larger as well. This ice melt and ocean expansion lowers albedo further and is one of the positive feedbacks that effects and is expected to continue to effect man made climate change.