Natural-gas futures plummeted to a new two-year low on Monday, undoing big gains that started the session as traders looked to cash in on a volatile market. Natural gas for February delivery settled down 12.1 cents, or 4%, at $2.882 a million British thermal units on the New York Mercantile Exchange. Prices had climbed more than 5% after electronic trading opened Sunday evening, then steadily retreated just before floor trading opened in the morning. Both bulls and bears sold, a trader and a broker said. People who bet prices would rise late last week cashed out those bets to lock in profits, while people who believe prices will fall wanted to take advantage of higher prices to place new bets, they said. Record production is keeping many investors bearish even with a burst of cold spreading across the country this week, said Michael Doyle, a broker […]