The crisis in Pakistan is growing as advancing floodwaters have forced more people to abandon their homes. On Thursday, the flooding devastated new areas of southern Punjab province, home to half of Pakistan’s 170 million people. Over 500,000 people have been evacuated and 250,000 homes destroyed so far. The death toll remains at over 1,600 but is expected to rise. The United Nations says over four million Pakistanis have been affected by the flooding, which it calls “a major catastrophe.”