THe Pentagon had a recent report made available to the mass media in
which the scenario of Abrupt Climate change was analysed. Some people
in here like Tom McDonald claim that no such thing can happen. I guess
he isn't aware of the ice core samples which prove that climate can
undergo radical departure from the normal temperatures in a very short time.

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Schwartz, Peter and Doug Randall. An Abrupt Climate Change Scenario and
Its Implications for United States Security. October 2003. (report
commissioned by the US Dept. of Defense - Available at:
http://www.ems.org/climate/pentagon_...ge.html#report).

From National Public Radio Living on Earth Segment Broadcast March 5th,
2004 on these issues a Dr. SCHRAG, Professor of Earth and Planetary
Sciences at Harvard University was interviewed. He noted the following
after Steve Curwood's question:

CURWOOD: Why now all this attention to the question of abrupt
climate change? The Greenland ice core samples that you told us about
have been around for a long time, demonstrating that it didn't take more
than a few decades to change a lot of temperature. And yet today, folks
like the Defense Department, folks in Hollywood, are suddenly paying
attention to the question of abrupt climate change. Why is that happening?

SCHRAG: I think there are powerful forces in our society that have
a lot of economic stake in our current energy technology, and are
resistant to change. And therefore have promoted the idea that this was
just a theory, that climate change was just an idea that scientists had
that they weren't sure about, and discouraged action on this front.

http://www.cseti.org/position/greer/goingtactical.htm