Natural-gas futures sank to a one-month low Wednesday as forecasts for warmer temperatures sparked concerns that demand for the heating fuel will fade in the next few weeks. Natural gas for February delivery fell 8.3 cents, or 1.9%, to $4.216 a million British thermal units on the New York Mercantile Exchange and posted their lowest settlement value since December 6. Prices had run up more than 20% since early November as unusually frigid weather boosted usage of the fuel that nearly half of all U.S. households rely on as their primary heating source. But the futures market has pulled back by 7% over the past two-and-a-half weeks as many traders […]