MCDONALD’S global sales forecast for this year was at risk after a China food scandal drove away diners and forced it to scramble to find new suppliers of ingredients for Chicken McNuggets and Big Macs, the company said on Friday. The warning could portend its first full year of global sales declines at established restaurants since 2002, Janney Capital Markets analyst Mark Kalinowski said in a note. The company’s global same-restaurant sales dropped a more-than-expected 2.5 percent in July, which he said was the worst monthly performance in a decade. The trouble in China hit as the world’s biggest hamburger chain was pushing to bolster its US business, where monthly sales at established restaurants have been down or flat since November.– Reuters