The environment plays a crucial role in determining the freshness and taste of stored coffee beans. When coffee beans are exposed to oxygen in the air, they undergo oxidation, leading to staleness or even a rancid flavor over time. This process can result in a loss of fresh aroma and develop an undesirable aftertaste, particularly noticeable in black coffee. Storing coffee beans in airtight containers helps mitigate this issue by reducing exposure to oxygen and sunlight, thus extending their lifespan. Additionally, carbon dioxide released during degassing can affect the taste if not properly managed through regular opening of the container to prevent CO2 buildup.