In the same way that the 20th century was the century of world wars, genocide, and grinding ideological conflict, the 21st will be the century of natural disasters and technological crises and unholy combinations of the two. It’ll be the century when the things that we count on to go right will, for whatever reason, go wrong. Late last month, as the Mississippi River rose in what is destined to be the worst flood in decades, and as the residents of Alabama and other states rummaged through the debris of a historic tornado outbreak, physicists at a meeting in Anaheim, Calif., had a discussion about the dangers posed by the sun. Solar flares, scientists believe, are a disaster waiting to happen. Thus one of the sessions at the American Physical Society’s annual meeting was devoted to discussing the hazard of electromagnetic pulses (EMPs) caused by solar flares or terrorist attacks. Such pulses could fry transformers and knock out the electrical grid over much of the nation. Last year the Oak Ridge National Laboratory released a study saying the damage might take years to fix and cost trillions of dollars. But maybe even that’s not the disaster people should be worrying about. Maybe they should worry instead about the ARkStorm. That’s the name the U.S. Geological Survey’s Multihazards Demonstration Project gave to a hypothetical storm that would essentially turn much of California’s Central Valley into a bathtub. It has happened before, in 1861-62, when it rained for 45 straight days. The USGS explains: “The ARkStorm draws heat and moisture from the tropical Pacific, forming a series of Atmospheric Rivers (ARs) that approach the ferocity of hurricanes and then slam into the U.S. West Coast over several weeks.” The result, the USGS determined, could be a flood that would cost $725 billion in direct property losses and economic impact.
more from Joel Achenbach at Slate here.