Governments across the world are simultaneously urging citizens and institutions to prepare for prolonged disruptions to power, communications, payments and supply chains. T he Pentagon’s FORTRESS initiative aims to keep major U.S. military bases operating independently for at least 90 days through microgrids, battery storage, portable nuclear reactors. Britain's Be Ready campaign is advising households to maintain 72 hours of essentials including water, food, medicines, torches, power banks, radios and cash.