Reuters: The U.S. Coast Guard said on Wednesday it will use a “controlled burn” to battle a giant oil slick from last week’s deadly offshore drilling rig explosion, as the spill threatened wide-scale coastal damage for four U.S. Gulf Coast states. The leaking well, 5,000 feet under the sea off Louisiana’s coast, has created an oil sheen and emulsified crude slick slightly bigger than the U.S. state of West Virginia, the Coast Guard said. Eleven workers are missing and presumed dead …