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23 Pace Envtl. L. Rev. 3 (2005-2006)
Irreversible and Catastrophic: Global Warming, Terrorism, and Other Problems

handle is hein.journals/penv23 and id is 13 raw text is: PACE ENVIRONMENTAL LAW REVIEW

Volume 23             Winter 2005-2006             Number 1

ELEVENTH ANNUAL LLOYD K. GARRISON
LECTURE ON ENVIRONMENTAL LAW
Irreversible and Catastrophic: Global
Warming, Terrorism, and Other Problems,
CASS R. SUNSTEIN*
Thank you very much. It's a pleasure to be here. I had a fan-
tastic afternoon on the premises. I'm really grateful for the
warmth and the substantive conversations.
What I'm going to be focusing these comments on is some-
thing called the precautionary principle. And if you haven't heard
of the precautionary principle, you will before long. The precau-
tionary principle is very popular in Europe. It is an idea for or-
ganizing environmental protection and regulation of risk in
general. The United States in the last few years has fought hard
against the precautionary principle on grounds that are occasion-
ally obscure. But one thing that we can say is that the United
States, in the last few years, has in one sense firmly endorsed the
precautionary principle. In defending the Iraq War and many
measures to fight against terrorism, the United States empha-
sized that you don't need certainty that harm will occur; you
1. This is a lightly edited transcript of the lecture Professor Sunstein delivered
at Pace University School of Law on April 25, 2005. The lecture drew heavily on three
works: Cass Sunstein, Irreversible and Catastrophic, CORNELL L. REV. (forthcoming
2006); CAss SUNSTEIN, LAws OF FEAR: BEYOND THE PRECAUTIONARY PRINCIPLE (2005);
and Cass Sunstein, Beyond the Precautionary Principle, 151 U. PA. L. REV. 1003
(2003) [hereinafter Beyond the Precautionary Principle].
* Karl N. Llewellyn Distinguished Service Professor of Jurisprudence, Univer-
sity of Chicago Law School and Department of Political Science.

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