Where does your garbage end up? All the garbage that you don't reuse or find a way to recycle goes into landfill sites or it gets burned. Neither of these disposal methods is ideal. The Unites States has about 1,650 landfills. These big holes in the earth are often just outside cities and towns, where the garbage sits and slowly break down over the course of several centuries. In the past, sites were simply covered with earth but modern landfill sites, however, are better: they have walls to stop the surrounding earth from becoming toxic and polluting nearby water sources. But the world is slowly running out of suitable sites for landfills. A much smaller proportion of your garbage is burned. This used to pollute the air, sending environmentally damaging gases into the atmosphere. Today, this process is much cleaner and less damaging to the environment. In fact, the energy released by burning the garbage can be used to produce heat and electricity. Choose the correct answers. What are landfills?