The UN and hosts the United Arab Emirates say these talks, known as COP28, will be the most important since Paris in 2015.
"Right now, we're taking baby steps where we should be taking great leaps and great strides to get us to where we need to be," said UN climate chief Simon Stiell.
On Friday and Saturday, about 140 heads of state and government -- Pope Francis had to cancel last minute due to the flu -- are expected to articulate their ambition after a year of devastating floods, wildfires and storms across the gl.
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