Reuters: U.N. talks billed as a "turning point" in a bid to slow global warming open on Monday seeking to agree curbs on greenhouse gas emissions and raise billions of dollars for the poor in aid and clean technology. The two-week talks, ending with a summit of 105 world leaders including U.S. President Barack Obama on December 18, will have to overcome deep distrust between rich and poor nations about sharing out the burden of costly curbs on emissions. The planned attendance of the …