
It's a scene fit for a Hollywood movie: A terrorist group launches a nuclear weapon from a ship off the coast of the United States. But instead of directly hitting a city or military installation, it detonates miles above the ground, seemingly causing no damage. Almost instantaneously, the lights darken over a large portion of the United States, cars stop in the middle of the road, and computers go dead. Panic ensues and the nation is soon economically and militarily crippled, sent back to the pre-modern era.
This is the catastrophic scenario depicted in the opening scene of a 1980s-style public service announcement released last year by EMPACT America, a nonprofit organization dedicated to "protecting the American People from a nuclear or natural electromagnetic pulse (EMP) catastrophe."
First observed in a 1962 high-altitude nuclear weapons test over the South Pacific, EMP is an intense burst of electromagnetic radiation resulting from a large explosion that can potentially wipe out all unprotected electronics. During the Cold War, strategists worried about EMP primarily as part of a larger nuclear scenario: Military hardware needed to be hardened against the pulses' effects to be able to survive a nuclear exchange with the Soviet Union.
In recent years, however, and particularly after 9/11, EMP has emerged as the latest fear factor-type threat among Washington's doomsday crowd. "A single EMP attack may seriously degrade or shut down a large part of the electric power grid in the geographic area of EMP exposure effectively instantaneously," the congressionally mandated EMP commission concluded in its 2008 report. In recent months, EMP fears have resurfaced as Iran hawks like Newt Gingrich and Daniel Pipes have suggested that the Islamic Republic could use an EMP against the United States.
There have been any number of dire scenarios -- of varying degrees of probability -- that have caught Washington's attention over the years: The threat of nuclear Armageddon drove U.S. policy during the Cold War; "Y2K" led to a national campaign to fix computer bugs; and the threat of terrorist attacks post-9/11 has led to two wars and billions in new spending for intelligence and counterterrorism efforts. Cybersecurity and the concept of a "digital Pearl Harbor" are now gaining traction, with the director of national intelligence warning that cyberattacks could "wreak havoc" on the United States.
One of the most outspoken prophets of EMP doom has been physicist Lowell Wood, the brain behind such Reagan-era Star Wars weapons as Project Excalibur, the plan to create a hydrogen-bomb-pumped X-ray laser to shoot down enemy missiles; and Brilliant Pebbles, the concept of deploying thousands of anti-missile satellites in orbit over the United States. Wood famously called EMP "a continental-scale time machine" in a 1999 hearing to discuss the threat.




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