Shrinking barley yields caused by climate change will be disrupting the beer industry in the coming decades. The grain is central to beer production, and a new study published on Monday signals trouble for brewers who rely on the failing crop. Beer is the most popular alcoholic beverage worldwide, and consumers are equally as dismayed by the report, which will cause a surge in beer prices up to two times its current cost for some nations. The shortages in barley production are caused by extreme weather that has intensified because of global warming.