Recent papers have suggested that a rise in volcanism was largely responsible for the cooling trend.

In 2006, Gray predicted a cooling trend by 2009-2010.

But the methods that seemed to contain any hope of stopping the cooling trend sounded drastic indeed.

The cause of the cooling trend is not known with certainty.

The funny thing was, I knew there was a "cooling trend" going on.

The Army knew there was a cooling trend going on.

The cooling trend has lasted longer in the Northeast than in any other region.

But if the weather continued its cooling trend, it would be time for the wools.

The cooling trend continued in the Miocene, with relatively short warmer periods.

Analysts also said they were seeing the start of a cooling trend.