Oil industry sinkhole threatens to swallow city
MNN, 10 November 2009
"U.S. 285 south subject to sinkhole 1,000 feet ahead," reads a bright yellow sign along the stretch of highway heading through Carlsbad, N.M. Normally a motorist driving through the area might not find a sign like that unusual. The city is, after all, home to Carlsbad Caverns National Park, a network of some of the largest natural caverns in North America. But on this occasion, the sign's sharp colors make the message clear: what'