Natural gas closed at a two-week low Monday as warming weather forecasts and effects from the crude selloff continue to rip through energy markets. The front-month January contract settled down 8.1 cents, or 2%, at $4.007 a million British thermal units on the New York Mercantile Exchange. It spent most of the trading session below $4/mmBtu, sinking to its lowest intraday point since October and closing at its lowest settlement since Nov. 13. Prices had peaked above $4.50/mmBtus just two sessions ago, but fears of a cold December have dissipated. Half of all U.S. homes use gas for heating, making weather the big driver in the natural-gas market. Weather forecasts had shown the type of cold that could create an early start to the winter heating season, but are now giving way to an unseasonably warm December, damping expectations for demand and putting prices into […]