His theory puts forth the idea that global warming is the precursor to us entering another ice age.
His theory makes a great deal of sense, to me.
Part of the reason for this may be because it is only during a time of increased warmth, which increases precipitation, that glaciers can build. See? Lots of snow equals big glaciers. I'm sure an increase in glacial cover will cool things down a bit. The cooling will decrease precipitation and cloud cover allowing radiational cooling of the planet surface. Next up will be an "ice age" or period of overall cooler temperatures. The cooler temperatures will decrease precipitation and create more deserts and possibly dust bowls. Eventually the planet will self-correct and warm up. And then the whole cycle will start all over again.
How's that?