Reuters: Environment ministers struggled to nudge forward climate talks in Copenhagen on Sunday, and police detained more than 250 protesters on a second day of mass action. Church leaders handed a petition with half a million signatures to the United Nations and prayed for climate justice, while hundreds of demonstrators marched through the city center for a second day to remind world leaders of the huge public pressure for a successful deal at the Dec 7-18 talks. “We are telling them: …