Monsoon shift, like today's erratic weather, wiped out Indus civilization 4,000 years ago, finds a study by top Indian institute

Researchers at the Indian Institute of Tropical Meteorology have discovered that climate factors similar to those affecting today's monsoons likely caused the collapse of the Indus Valley Civilization over 4,000 years ago. By analyzing ancient cave formations, they found that reduced solar radiation, El Niño, and other factors weakened the monsoon, leading to prolonged droughts.