Shipping group Maersk raised its full-year earnings and market demand forecasts on Thursday, partly due to disruptions to Red Sea trading routes, but also said prospects for the fourth quarter were uncertain.The Danish group, seen as a barometer of world trade, said it now expected global container market volumes to increase 4-6% this year, up from its previous forecast of growth at the upper end of a 2.5-4% range.It added, however, that there was a lack of clarity around supply and demand in the fourth quarter of the year.Maersk's share price initially rose on the news…