OPEC crude production gained for a second month in January as the group boosted its forecast for global oil-demand growth this year. The Organization of Petroleum Exporting Countries, responsible for 40 percent of the world’s oil, said that supply from its 12 members increased by 28,000 barrels a day to 29.71 million barrels a day in January as Libya pumped more, according to its monthly report. That compares with 29.68 million barrels a day in December, OPEC said, citing data from secondary sources. The group raised its estimate for global demand growth amid an improving outlook for the world economy. “Demand in 2014 is projected to see some improvement,” OPEC said. “Economic conditions in the U.S. and Europe may turn out better than expected.” Brent crude futures have slipped 1.6 percent this year, trading at about $109 a barrel in London today. That’s within the $100 to $110 range […]