Citing deepening geopolitical divisions, wars with no end in sight, climate change and nuclear and emerging weapons, he says humanity is "edging towards the unimaginable – a powder keg that risks engulfing the world.

'We are edging towards the unimaginable – a powder keg that risks engulfing the world,' Antonio Guterres says.

U.N. Secretary-General António Guterres warned world leaders Tuesday that impunity, inequality and uncertainty are creating an “unsustainable world” where a growing number of countries believe they should have a “get out of jail free” card.

"We can't go on like this," he said as the General Assembly's annual debate among presidents, prime ministers, monarchs and other leaders began. Citing deepening geopolitical divisions, wars with no end in sight,