Agence France-Presse: During crunch talks in Copenhagen next week, Mexico will propose to slash its greenhouse gas emissions by 50 percent by 2050 so long as it receives international aid, officials said Tuesday. The second-largest economy in Latin America after Brazil also aims to reduce emissions from the heat-trapping gases by six to seven percent by 2012 “if we have the necessary technology and financing,” Environment Minister Juan Rafael Elvira Quesada told reporters. “If we had the budget, …