“However, it’s not clear what could have led to the violence: “Neither CLIMATE CHANGE, ethnic conflict nor competition over material resources seem to offer convincing explanations,””
I doubt they were all that concerned about sea levels rising a few inches in the next 50 years especially because they were lucky to live half as long.
not “concern about” a climate change, but “reaction to” — as in when due to climate change, the tributaries of the Indus river dried up, driving the Harappans (Dravidians) to
1. abandon the large cities of the Harappan / Indus valley civilization
2. move south and east - to the Deccan and Ganga-Jamuna valley
3. merge with the pastoralist Indo-Europeans