- Glass. It comes from the earth. It's three quarters sand. Some people think all the glass they use is a bigger problem than it is. And they're worried about conserving our natural resources. Well, the people who make glass bottles are concerned too. They've always used old glass to make new glass. And they found many useful ways that glass can be returned to the earth. There are machines that grind it into grains like sand. Glass makes the most sanitary landfill. It's good for road beds. You can mix it with asphalt, make glassphalt and pave roads with it. From the earth, to glass, and back to the earth. A cycle as natural as life itself. The people who make glass bottles are doing their part. And you can help too. Don't leave bottles where they don't belong.