Such weather¬related tragedies are not new to Pakistan; what's different is their frequency and ferocity. Deadly floods have become a yearly occurrence; in 2010, record¬breaking rains killed nearly 2,000 people and drove millions from their homes. Even as Pakistan fights one of the world's most pitched battles against terrorism, increasingly violent weather is pushing up the cost of food and clean water, threatening energy supplies, undermining the economy and posing a potent and costly security threat.