3. A secondary magnetic field is induced in metallic items, and magnetic repulsion pushes them clear of the waste stream.
1. A stream of waste material travels along a conveyor belt and passes under a camera.
2. Each type of materia! reflects a unique combination of wavelengths in the infrared spectrum and can thus be identified.
In an international study published last year  by the Waste & Resources Action Programme, a British group, researchers compared more than 180 municipal waste management systems. Recycling proved better for the environment than burying or burning waste in 83 percent of the cases.
It makes sense to reuse products, of course, and to reduce consumption altogether, as well as to improve initial product design. But given the rising mounds of waste worldwide, it also makes sense to recycle.
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