Wired battlefield
Richard Clarke is a prophet of doom who has been sounding the alarm about a cyber-Apocalypse for more than a decade. The former top counter-terrorism advisor for U.S. presidents Bill Clinton and George W. Bush envisions a scenario in which computer hackers simultaneously take down the Pentagon's computer networks; trigger explosions at oil refineries; release chlorine gas from chemical plants; disable air traffic control centres; cause trains and subways to collide; delete all the data on the computers of the U.S. Federal Reserve and major banks and then take down power grids, plunging the United States into darkness from coast to coast. It's a vision of cyber war in which thousands die; cities run out of food; the world's finance system collapses and looters take to the streets. "In all the wars America has fought, no nation has ever done this kind of damage to our cities," Mr. Clarke says. "But a sophisticated cyber war attack by one of several nation...