They really should stop referring to the ice growth as "exponential", it is not, it is growing sinusoidal; in a complex and partly chaotic cyclical pattern of growth and retreat. The climate is cyclical, regardless of what we do, and the cycles are incredibly complex to the point that the cannot be modeled to any great level of detail. You could make some broad inferences using Milankovitch, but not much more than that, and even they are somewhat chaotic.