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complex, it is rare for an issue to be entirely settled. By the late 1980s, it did seem to be an established fact that ice ages were timed by orbital variations. But what kind of feedbacks amplified the effect? Some people challenged whether any of this was really understood. The cycles, most scientists now agreed, involved not only orbital variations in solar irradiation, but also a variety of geological effects. First came the massive creation, settling and flow of continental ice sheets, which naturally would work on a timescale of tens of thousands of years. But large-scale physical and chemical changes in the oceans might be important too. New evidence gave a particularly crucial role to changes in CO2 and Popular weed leaf high life four twenty low top shoesother greenhouse gases, changes apparently driven not just by geochemistry and ocean circulation, but still more by changes in biological activity. And of course the biosphere depended in turn on climate — and not just temperature, but also trickier matters like fertilization of the seas by minerals eroded from glacial era deserts. Further unexpected influences were added to the list of possibilities almost every year. It would take much more study to determine just what combination of effects determined the shape of glacial cycles. In

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