The most common metals to consider when discussing recycling are aluminum and steel. Some other metals–like gold, silver, brass, and copper–are so valuable that they are rarely thrown away. They do not create a waste disposal problem. Aluminum and steel do. Americans use 100 million steel cans and 200 million aluminum beverage cans every day. What should we do with this metal waste? Should we burn it in waste-to-energy plant? Should we landfill it? Or should we recycle it?