From International Herald Tribune

http://www.iht.com/bin/print_ipub.php?file=/articles/2006/04/25/opinion/edzbig.php But there are four compelling reasons against a preventive air attack on Iranian nuclear facilities: 1. In the absence of an imminent threat (with the Iranians at least several years away from having a nuclear arsenal), the attack would be a unilateral act of war. If undertaken without formal Congressional declaration, it would be unconstitutional and merit the impeachment of the president. Similarly, if undertaken without the sanction of the UN Security Council either alone by the United States or in complicity with Israel, it would stamp the perpetrator(s) as an international outlaw(s). 2. Likely Iranian reactions would significantly compound ongoing U.S. difficulties in Iraq and in Afghanistan, perhaps precipitate new violence by Hezbollah in Lebanon, and in all probability cause the United States to become bogged down in regional violence for a decade or more to come. Iran is a country of some 70 million people and a conflict with it would make the misadventure in Iraq look trivial. 3. Oil prices would climb steeply, especially if the Iranians cut their production and seek to disrupt the flow of oil from the nearby Saudi oil fields. The world economy would be severely impacted, with America blamed for it. Note that oil prices have already shot above $70 per barrel, in part because of fears of a U.S./Iran clash. 4. America would become an even more likely target of terrorism, with much of the world concluding that America's support for Israel is itself a major cause of the rise in terrorism. America would become more isolated and thus more vulnerable while prospects for an eventual regional accommodation between Israel and its neighbors would be ever more remote.