Reuters: With tree-lined boulevards, stately French colonial architecture and hundreds of small side alleys, Vietnam’s capital Hanoi is a city steeped in culture and history. It’s also a fast-growing business centre, with glass-fronted skyscrapers springing up next to century-old teak houses. But balancing tradition and modernity isn’t the only challenge for Hanoi’s planners. They are strengthening the dike system to protect the city from weather-related disasters like storms and floods, which …