ClimateWire: A stress test prepared by Lloyd's of London concluded that a chain reaction of floods, drought and related diseases could cripple the world's food supply, leading to a crisis that could spark further unrest, including the possibility of rioting in major cities, a terrorist attack in the United States and even a Russian invasion. Lloyd's, a major global insurer, outlined the scenario in a report last week. It is seen as an unlikely but possible scenario that could cut across the insurance industry's...