Reuters: U.N. climate talks must set aside hopes of a treaty to curb global warming and, to avoid failure, must accept rich country emissions targets which many scientists say are inadequate, a U.N. official said on Thursday. The U.N.-led process failed at a conference in Copenhagen last December to agree a successor to the Kyoto Protocol which expires in 2012. Countries and experts have widely dismissed hopes for a full treaty at the next major meeting in Cancun, Mexico at the end of this …