UNITED NATIONS (AP) — The head of the United Nations warned gathered leaders Tuesday that impunity, inequality and uncertainty are driving modern civilization toward “a powder keg that risks engulfing the world" — the latest clarion call from Antonio Guterres that the global situation is becoming intolerable and unsustainable.

“We can’t go on like this,†the secretary-general said in an alarming state-of-the-world address as he opened the annual high-level gathering of the U.N.’s 193 member nations.

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