Bruce Thompson at American Thinker writes:

John Fialka of the Wall Street Journal uncovered an interesting admission from Tom Delworth, a climate modeler for the National Oceanic and Atmospheric Administration, the government agency in charge of climate science and weather service.

But, so far, the supercomputers the agency uses to model the effect on the earth’s climate — which were also used for the IPCC report — aren’t detailed or fast enough to predict how much clouds are accelerating the problem. Mr. Delworth said computer models divide the earth’s oceans and atmosphere into four million boxes, each about 150 square miles, and that these boxes are too large to model the effects of clouds.

“We could use computers that are one million times faster than they are today and still not be satisfied,” Mr. Delworth said.

We know that the default state of the world for the last few million years has been an ice age. We are currently basking in an inter-glacial period that could end at any time. So, can these models discover a prior or future ice age? If they cannot run forward or backwards to an ice age then they are virtually useless.