In a study released last August, University of Washington researchers found that babies between 8 and 16 months recognized an average of six to eight fewer words for every hour spent watching videos.Susan Jacoby, in The Dumbing Of America

The operation, which senior Iraqi officials had been signaling for weeks, is considered so important by the Iraqi government that Prime Minister Nuri Kamal al-Maliki, who went to Basra on Monday, intended to personally direct the fighting, several Iraqi officials said.NY Times

We’re exposing parts of the capital markets that most of us had never heard of
Ethan Harris, a top Lehman Brothers economist.

So while language isn’t a requirement for all thought, it most definitely appears to be a requirement for some thought.
Newton, A.M., Villiers, J.G. (2007). Thinking While Talking: Adults Fail Nonverbal False-Belief Reasoning. Psychological Science, 18(7), 574-579. Cognitive Daily.

“The extent of de-leveraging involves a wholesale destruction of credit. The risk is that the ’shadow banking system’ completely collapses.”
For the first time since this Greek tragedy began, I am now really frightened.
Ambrose Evans-Pritchard, International Business Editor, The Telegraph