The derivatives time bomb is ticking.....

(MarketWatch) -- "Charlie and I believe Berkshire should be a fortress of financial strength" wrote Warren Buffett. That was five years before the subprime-credit meltdown. "We try to be alert to any sort of mega-catastrophe risk, and that posture may make us unduly appreciative about the burgeoning quantities of long-term derivatives contracts and the massive amount of uncollateralized receivables that are growing alongside. In our view, however, derivatives are financial weapons of mass destruction, carrying dangers that, while now latent, are potentially lethal."

That warning was in Buffett's 2002 letter to Berkshire shareholders. He saw a future that many others chose to ignore. The Iraq war build-up was at a fever-pitch. The imagery of WMDs and a mushroom cloud fresh in his mind.

Also fresh on Buffett's mind: His acquisition of General Re four years earlier, about the time the Long-Term Capital Management hedge fund almost killed the global monetary system. How? This is crucial: LTCM nearly killed the system with a relatively small $5 billion trading loss. Peanuts compared with the hundreds of billions of dollars of subprime-credit write-offs now making Wall Street's big shots look like amateurs. Buffett tried to sell off Gen Re's derivatives group. No buyers. Unwinding it was costly, but led to his warning that derivatives are a "financial weapon of mass destruction." That was 2002