Climate change threat has 'never been worse', says UN climate chief

With the direst environmental warnings yet still ringing in their ears, nations gathered in Poland for a UN summit aimed at heading off the "urgent threat" of runaway climate change.

Demonstrators hold signs and wave flags as they march in the main EU quarter during a 'Claim the Climate' march in Brussels. Source: AP

The UN talks come at a crucial juncture in mankind's response to planetary warming.

The smaller, poorer nations that will bare its devastating brunt are pushing for richer states to make good on the promises they made in the 2015 Paris agreement.

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