https://www.af.mil/News/Article-Display/Article/110516/jb-elmendorf-richardson-turns-landfill-gas-into-energy/

What does reusing our resources mean?

By saving materials that we have used in the past, we can conserve energy that will postively impact the environment. Old materials can be used to make new things. Reusing and recycling conserves land, keeping it from becoming landfill space.