Associated Press: Developing countries upbraided rich nations at U.N. climate talks Thursday, saying they were refusing to act boldly enough to stop global warming. Mexico sought to prod others into action by becoming the first developing country to announce a cap on greenhouse gas emissions. As 145 environment ministers and other leaders gathered in Poland for the final phase of the two-week talks, delegates from poor countries made emotional pleas to wealthier countries to take the lead in cutting …