For decades, the arrival of summer in South Korea was heralded by the rhythmic hum of cicadas and the predictable onset of monsoon season. But as climate change rewrites the country’s seasonal script, the government is bracing for a new reality. On Wednesday, the Korea Meteorological Administration announced a sweeping overhaul of its national weather warning system, the first major restructuring in nearly two decades. The centrepiece of the plan is the introduction of a top-tier “extreme heat..