Agence France-Presse: Major economies looked Monday at how to cooperate in shifting to cleaner sources of energy, with a top policy board warning the world’s current path was unsustainable. Senior officials from economies making up 80 percent of global Gross Domestic Product opened two days of talks in Washington in a US initiative to find common ground amid torturous negotiations on a new climate change treaty. The meeting comes as the United States tries to end the worst oil disaster in its …