Bloomberg Crude tumbled below $52 a barrel as disappointing corporate earnings forecasts in the US stoked concern about the global economy, weighing down a market already anxious about America’s oil boom. Futures in New York dropped as much as 3.5 percent, joining the slide in equities after chip-marker Nvidia Corp and heavy-equipment company Caterpillar Inc warned of slowing global growth. …

Bloomberg China’s oil refining giant said its trading unit lost almost $700 million last year after being wrong-footed by zigzagging markets, revealing one of the biggest losses by a commodity trader in the last decade. Sinopec blamed the losses at its Unipec unit in part on “inappropriate hedging techniques” and said it closed its positions after discovering the problem. Oil …

Bloomberg China’s offshore oil and gas experts are dipping their toes in wind power, bringing their experience working on the ocean floor and adding a new twist to their portfolios. Cnooc Ltd., the country’s top offshore oil explorer, said it wants to use its expertise in marine geology to replicate its success in the offshore wind sector. The company entered …