Bali turned into torrents of mud and debris recently as floods killed at least 18 and displaced hundreds. Cars and motorbikes were swept away and tourists evacuated from hotels. The disaster was fuelled by days of heavy rainfall that overwhelmed rivers already narrowed by upstream deforestation and rapid development. The resort island was, for several days, gripped by chaos.Almost simultaneously, typhoon Ragasa tore across the Philippines before curving towards China’s coast. Winds flattened...