OneWorld U.S.: South Carolina voters concerned about global warming are calling on the Democratic candidates for president to focus on climate change solutions as they stage a public debate in the resort town of Myrtle Beach this evening. "Climate change is a top concern of South Carolina primary voters," said Cynthia Powell, a Myrtle Beach resident and undecided voter. "We see a clean energy future in South Carolina as the best way to create jobs and protect the …