Before the invention of freezer compartments in the 1920s, people depended on ice, holes in the ground and window sills to extend the shelf life of perishable foods. After Upton Sinclair described the working conditions in Chicago’s meatpacking district in his book, The Jungle, public awareness regarding food safety and climate control significantly increased, leading to the Pure Food and Drug Act. When scientists identified that cool, sanitary conditions helped control the outbreak of food-related illnesses, healthier food processing followed. Thanks to continuing advances in climate control solutions and improvements in cold chain processes, modern food systems better ensure the safety and quality of the goods consumers eat and drink.