U.S. natural gas futures jumped about 6% to a three-week high on Monday as producers cut output after prices collapsed to a 3-1/2-year low in recent weeks. Front-month gas futures for April delivery on the New York Mercantile Exchange rose 11.7 cents, or 6.4%, to $1.952 per million British thermal units (mmBtu) at 1:05 p.m. … Read more