Modesto Bee: How much does a cold glass of milk contribute to global warming? It turns out that producing and consuming milk in the United States accounts for 2 percent of the nation’s climate-changing emissions, according to a new report from the Innovation Center for U.S. Dairy. The industry-backed group tracked milk from farm to processing plant to grocery store to consumer. The report deals with emissions of carbon dioxide and other gases believed to be building up in the atmosphere and …