Associated Press: Top economies and developing nations joined hands in the fight against climate change Wednesday, vowing support for U.N.-led global warming talks at the conclusion of a sprawling summit that pledged more aid for Africa and condemned Zimbabwe’s disputed presidential vote. On the final day of a three-day Group of Eight summit, a U.S.-sponsored group of 16 countries and the European Union said they would set medium- and long-term goals to reduce greenhouse gases to save the planet from …