Reuters: The White House voiced “serious concerns” on Saturday about future negotiations to fight global warming while praising a deal to launch a new round of international climate talks. Nearly 200 nations agreed at U.N.-led talks in Bali to begin discussions on a new climate change pact after a reversal by the United States allowed a breakthrough. The countries approved a “roadmap” for two years of talks to adopt a new treaty to succeed the Kyoto Protocol, the …