BBC: Climate change: 'World at crossroads' warning as key talks begin

Four senior figures behind efforts to limit climate change have warned that the planet "is at a crossroads" as key talks opened a day early in Poland. 

"In a rare move, four former presidents of the United Nations-sponsored talks called for decisive action.

The meeting in Katowice is the most critical on climate change since the 2015 Paris agreement. 

Experts say that drastic cuts in emissions will be needed if the world is to reach targets agreed in Paris."

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