The greenest way to enjoy a soda pop? Using a reusable cup and a soda fountain. While plastic, glass and aluminum containers are all recyclable, they all have their pros and cons when choosing the fizzy stuff. Oil is used to make plastic bottles, and the resins are not infinitely recyclable. While glass is infinitely recyclable, it's heavier, so the carbon footprint to ship glass bottles is higher than plastic; plus, only 25 percent of glass bottles are actually recycled. And aluminum? While 50 percent of the can is recycled, the other half is virgin aluminum that comes from destructive mining practices. So using a reusable glass at a restaurant's soda fountain is the lightest and least destructive way to go.