Scientists warn of 'Space Weather Katrina' and say U.S. is unprepared

Scientists warn of 'Space Weather Katrina' and say U.S. is unprepared: "Scientists warn that the Earth might be vulnerable to a 'space weather Katrina,' an event that could leave large parts of the U.S. without power, water or access to communication. And the U.S. is unprepared for such a disaster."