France's top diplomat, who will preside over December's Paris summit tasked with signing a climate rescue pact, has warned of looming planetary "catastrophe" if negotiations fail.
Foreign Minister Laurent Fabius's remarks came as separate reports warned of the devastating effects of global warming on the poor and those living in megacities around the world.
"It is life on our planet itself which is at stake," Fabius told journalists on Sunday as ministers and climate envoys from 70 countries met for pre-summit talks to iron out tough political questions.
With the key UN conference just three weeks away, he also announced that Russia's President Vladimir Putin would attend the November 30 opening.
Russia, a major oil producer, is seen as a deal-maker or -breaker in the years-long attempt to negotiate the world's first truly universal pact to curb climate-altering greenhouse gas emissions.
"There is absolute urgency," said Fabius, to achieve the UN goal of limiting global warming to two degrees Celsius over pre-Industrial Revolution levels.
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