Plant shutdowns are leaving the U.S. dangerously close to meat shortages as coronavirus outbreaks spread to suppliers across the nation and the Americas. Almost a third of U.S. pork capacity is down, the first big poultry plants closed on Friday and experts are warning that domestic shortages are just weeks away. Brazil, the world’s No. 1 shipper of chicken and beef, saw its first major closure with the halt of a poultry plant owned by JBS SA, the world’s biggest meat company. Key operations are also down in Canada, the latest being a British Columbia poultry plant.